Testing Fuel Economy Hacks

We tested fuel economy hacks to see how you can actually save money at the pump.
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[@BigJohnLXV]

from what I've seen, in modern driving techniques, the most popular way to improve fuel efficiency is never stop for red lights

[@yeltsinhernandez7952]

lmao hahshah

[@masontorr6266]

Roll dem stop signs too, no cop no stop

[@wilfdarr]

This is one that drives me crazy: our mayor is always telling us how our cars are ruining the environment, but be dambed if he'll have the city engineers time the red lights!

[@kalmmonke5037]

they could limit speed limit enforcement to allow more momentum maintainence, less braking and powering up again, bc even with regenerative braking that is less effceint than maintaining momentum, and it decreases tire brake and battery electrics lifetime, which is less sustianble and adds to cost of living while wasting peoples lifetime on the road

[@wilfdarr]

@@kalmmonke5037 You could watch for the speed reduction and let aerodynamics do the breaking for you...

[@adamstahl8323]

Would definitely like to see Jeremiah make a big HHO generator

[@patrickmartin3322]

Yes, that would be awesome

[@Minecraft-md6fs]

So would i

[@ShaherIsmail]

1000000%

[@Psycho_912]

Curious to see what his system would look like

[@AndricKelton]

Yes

[@tokinGLX]

one of the best things you can do ties very well with the "watch how you drive, keep your foot out of it" line is to try to use your brakes as little as possible. obviously there will be times where you have to come to a stop, but there may be plenty of times where you can just let off the gas earlier and coast for longer, letting gravity and friction slow you down instead of braking.

[@marwerno]

Absolutely: My car has 178000km and still the first brake pads. May wife has a very similar car from same manufacturer and same weight. She had to change brake pads at 120000km EDIT: I just looked it up: they have even been changed at 90000km!

[@h5skb4ru41]

That is why I use engine braking, in some ways its much better than just abusing the brakes and having to pick up that speed.

[@dickJohnsonpeter]

​@@h5skb4ru41 Yep, especially engine braking down a hill. I can't stand it when people go fast and stop at the last second either, like why do that to your braking system? If you aren't racing you don't need your brakes as much as people think they do. I probably use my brakes twice as less as everyone else.

[@someguy9520]

I mean more brake pads and brake disc wear makes more tax dollars for the government 😂 I also almost exclusively use engine braking for slowing down. Only when necessary, the brake pedal is used Modern EFI engines also shut off fuel when engine braking. So when going downhill in the biggest gear, you burn no fuel

[@kadajawi6567]

@@someguy9520 Engine braking? Depends. Coasting saves fuel. Engine braking by changing down a gear or two or three does too, but your car won't actually generate any fuel. You simply save on brake pads by using the engine components as a brake pad.

[@pete-ph5xc]

It was super cool when Mythbusters did the hydrogen cell and it did nothing, but then turned around and showed that a regular carbeureted car will absolutely run off of direct hydrogen injection into the carb, at least until it backfired.

[@aaronfield7899]

What episode was that?

[@pete-ph5xc]

@@aaronfield7899 s4e10, exploding pants episode.

[@steam6626]

I mean, the hydrogen cell in the video here was powered by the engine, so there was no way for it to increase mpg

[@pete-ph5xc]

@@steam6626 fair point, though I thought the cell they were using had it's own power supply, but I could just be misremembering. In any case, the bigger issue was just that it couldn't generate enough volume any which way, even if it wasn't running off the engine.

[@josephoberlander]

Note that HHO kit actually "works" by tricking the O2 sensor into running the car lean. ($600 in snake oil and 10 cents in tinfoil) Yeah, repair bills might be in your future. Running modern cars super lean by tricking sensors won't end well.

[@OddBawZ]

Dude, Ecomod a small hybrid like a Honda CR-Z and then Ecomod something really uneconomical like a Hellcat to see which you can make a bigger difference on! That would be awesome.

[@benjaminwatson7868]

Odd, I know your secret now

[@dimitriskoulioumbis1082]

Ecomod an L3/33 lol

[@PhaseSkater]

im ecomodding a hyundai ioniq currently

[@kingjellybean9795]

Nah eco mod a hummer h3 that would be hysterical

[@bamastrac]

I drive 60 miles a day in a 01 grand marquis , definitely would like to see them do a ecomod on a big body car

[@Bunnunoox]

Yes please! Make a hyper-miler!! Also you should power it with Jeramiah's engine. Side-note: Justin's really gotten comfortable and is a lot fun to watch as a presenter now!

[@charadunne5704]

Please

[@HenryMidfields]

Gotta say, everyone in general are great in hosting their videos. Whether it's Nolan (who got me into watching Donut), Jerry, or Justin, or anyone.

[@ViceFielder]

The savings with throttle and brake discipline is mind boggling.

[@josephoberlander]

Then again, it requires controlling your throttle in literal 1-2mm increments. Manual transmissions also win big here because the transmission isn't trying to out-think you.

[@TheYardLimit]

That's my "Roadmaster" (Its actually a Caprice Wagon) featured at 11:11. The guy i bought it from built it to hypermile and tow trailers. It has a 5 speed out of a Chevy truck too. It easily gets 30mpg. It can get even better mileage if you keep your foot out of it.

[@tiagobelo4965]

huh, that's pretty neat, ever thought about giving it a common rail diesel? they tend to be pretty efficient and torquey, so a smaller one should be able to move that beast

[@NinjAsylum]

I can still remember the Mythbusters episode about the tailgate up/down. Literally one of the most definitive results in the shows entire history.

[@wise-dragon6776]

They did an episode with the semi also

[@LSFord]

@@wise-dragon6776 that episode was also surprisingly definitive. Like the semi made a huge difference and it got ridiculous the closer they got

[@WhiteWolfos]

What were the results?

[@drache444444]

@@WhiteWolfos iirc tailgate up was worse than tailgate missing, tailgate down was a bit worse than tailgate up, these nets that are supposed to replace the tailgate were best or second best, but covering it up completely was also very good.

[@thomasschwarting5108]

Yup, I saw that episode. With the tailgate open, the air DOES NOT flow the the way you think it should. I've been behind an open bed pickup and with a styrofoam cup back there and it just stays in the bed!!

[@OldManAzeban]

I think a hyper eco modded vehicle with Jeremiah’s hydrogen genny would be an interesting series. Start it in stages like Hi-Low and keep adding to it until you reach peak geek or startling efficiency!

[@censoredialogue]

replying to say i’d like to see this too

[@gurgleblaster2282]

Problem with hho generators and why they are a scam is they corrode. They will corrode before you get any cost savings.

[@lasskinn474]

just watch project farms video

[@chemieju6305]

@@gurgleblaster2282 they are also a scam because they use up electrical energy which one way or the other gets taken from the alternator. You take energy away from the engine, convert it from mechanical to electrical to chemical and then back to mechanical, losing a bunch of it along the way.

[@anydaynow01]

@@chemieju6305 Yep this, paying the conversion tax. It's not like they are using power that would otherwise be wasted like using exhaust heat or braking energy.

[@InnaciKorushka]

I have tested the tire thing myself. It 100% increses mpg. "Overinflating" is indeed bad and will likely cost you more, but inflating to the max rated psi on the tire or just slightly below that increased my mpg by about 2mpg. For perspective, i was getting about 13/14mpg in my F150. Now im getting around 16mpg depending on how aggressive i drive. Havent changed anything else.

[@matthewgamman4303]

i would not consider that 2mpg being worth me risking a blowout, and tire wear increase though

[@nthgth]

Yeah, I'm still gonna go by the manufacturer sticker

[@josephoberlander]

Ah, those crummy low rolling resistance "eco" tires most new cars come with... Yes, I get 2mpg less in my Mustang running proper summer tires. But it also is roughly 50% better in rain, traction, and more importantly, stopping. It also rides much smoother.

[@nthgth]

@@josephoberlander better mpg in rain with summer tires? And better ride? Wouldn't expect that, but icing on the cake

[@josephoberlander]

@@nthgth No, worse MPG overall. But grip in the rain and ride/handling was easily 50% better. It went from light and (overly) "agile" to planted to the road.

[@dougcook7507]

Using cruise controls is a huge way to help increase your MPG.

[@TheYardLimit]

Yes. But if you are really trying to save fuel. You turn it off up hill and let the car slow down a bit when going uphill instead of just maintaining your speed over a short rolling hill. Then get your speed back up on the back side of the hill.

[@gibbyg2001]

@@TheYardLimit That's probably right but it kind of defeats the point of cruise control.

[@brantkensinger3398]

This isn't true. Cruise control doesn't increase MPG. It decreases it. "Manual" throttle control is more efficient. In cruise control mode, the car has to constantly open the throttle (sometimes the whole way) to achieve a set speed. Manual throttle response allows the user to find that sweet spot where the car doesn't shift gears. Yes, you may decrease speed. But most cars are more efficient at 60 mph than at 75 mph anyway.

[@dougcook7507]

@@TheYardLimit The logic you start is the very reason not using cruise control is far less efficient. You foot is constantly pressing and releasing the throttle which results in accelerating more often. Which results in burning far more fuel. a simple Google search will result in verifying this.

[@TheYardLimit]

@@dougcook7507 Cruise control works great for hypermiling flat land. But if you are in an average car, especially with an automatic transmission, if you put the cruise on and come up to a hill, the car will sense the load but it wont know how long the grade is, its gonna kickdown a gear and give a bunch of gas to maintain speed. If you are really good at hypermiling, what you do is anticipate the grade. Perhaps use a downhill section to gain some extra speed without using too much power from the motor, and then back off the throttle coming up the grade. Let the car drop down to maybe 50mph from 65 or 60 if the grade is short enough for you to kind of coast up. Thats really hypermiling 101.

[@nerdonabudget]

Expectations: "Testing fuel economy hacks" Reality: *no testing was actually done*

[@simonmarkis]

Exactly… disappointing video…

[@erlend1554]

This is donut media what did you expect?

[@nerdonabudget]

@@erlend1554 ​ I mean, in their recent "We Tested the Dumbest Informercial Tools" video they actually tested everything, and a lot of their other videos they're actually hands on and actually DOING stuff. This fuel economy hacks video was lazy, essentially just reading off answers that they found around the internet instead of actually testing it and showing the results from their findings

[@spamemael5129]

@@nerdonabudget because most of these are just logic, and they're experts on cars. Do you really need to test if removing windshield wipers works?

[@3p1ks]

@@simonmarkis Who cares. The test isn't what's important, the results are.

[@willythewyno]

I'd like to see Jeremiah do literally anything he wants.

[@discoball725]

he's so funny 😭

[@schwuzi]

i love jerbear

[@salvador4911]

YES

[@LevelUpYourFandom]

damn i would absolutely LOVE to see yall truly try to make a hyper-miler car. ecomodding is wild but i would LOVE to see it work ahah how sick would it be to get a mustang to like 60mpg

[@hyundaitib2]

Tell them again I don't think they look at these comments hit the discord

[@scooby45247]

i would like to see you guys take a guzzler like a hellcat and make it economically viable.. what shape does it turn into? whats the final mpg?? so fun, make it a series if you want..

[@RUNFROMONYX]

the fact that they still have the "supercharger" on the vw shows dedication

[@drshocking1229]

honestly I feel like when they add the mods, they just do it for memes and keep it there just because it's like, it's funny to meme around-

[@impressivestory]

Justin is definitely a great addition to the team, and he's fitting in really well. Great stuff.

[@jetsamrover]

Came to say something similar. I've noticed a huge improvement, he's really coming into himself. Justin seemed awkward at first and was almost distracting, but he's clearly been working on his presence and probably receiving some coaching, and it is paying off.

[@ajman098]

Agreed. It was cool to see him host this!

[@jakuburban6289]

🙏

[@BusyB07]

geeez book a flight

[@Snowfireblues]

The windows up thing is actually variable. If you're riding slow, the air resistance will be naturally lower, and thus the impact of the windows being open is much lesser. HOWEVER after a certain speed threshold, the air resistance becomes much higher (the faster you go the more the wind resistance affects you), so having the windows up becomes more fuel efficient

[@TheIVJackal]

They got a lot wrong in my opinion, the EcoModder community I'm sure would strongly object to some of the "scams" here, like tire pressure! Didn't even finish watching the whole thing...

[@BogeyTheBear]

Somewhere above 40 mph, the drag of open windows hits the mileage harder than buttoning up and using the AC.

[@Jaburu]

there really should be more info out there about the speeds where the switch occurs

[@Burlehmangus]

Depending on your car, your engine size/power, and alternator draw….the whole electrical stuff using more fuel can actually be big. Anyone who owns an older gem Honda Fit knows that if you have your lights and radio on, and try to roll up or down 2 windows at the same time, it feels like you lose about 30% power lol. Also, I think the manual transmission thing is because you can neutral and coast. I used to hypermile in my 02 Saturn sc2 by neutraling whenever I could and would get 80 mpg plus

[@HarpreetSingh-nw3ec]

As a guy who drives a 50 HP beater car, I understand and relate with your every word.

[@TheSuperBoyProject]

The manual vs automatic is a thing because the transmission fluid in the torque converter has parasitic energy loss due to it splashing around and converting the momentum of the fluid to heat. With the clutch that doesn't exist since all the rotational energy of the crankshaft is directed to the wheels. Automatics have only recently began to match or exceed manual efficiency due to locking the overdrive gear when cruising instead of relying on the torque converter and of course more gears.

[@jarilangerak9390]

Not the healthiest thing for your transmission however. Lubrication suffers.

[@DiustheZ]

Transmission thing has nothing to do with "neutral and coast" You're causing harm to your car by going into neutral at any high speed. You could get the same result by just "coasting" as your foot is not on the accelerator you aren't continuously injecting fuel into the engine at high RPM.

[@mariuscarausu9352]

Had a vw polo 2003,went on a 2 week holiday.Had to jump start the car,worked fine untill I turned on the light,when I turned on the lights I lost power steering.Everything was fine when I got a new battery.

[@MyTrevonne]

Using cruise control helped me the most. Leave early and just cruise the speed limit

[@user-hn4iw5pf5r]

old car or new car, a heavy foot will hurt fuel mileage

[@tbag6600]

almost like the old government saying when trying to introduce the new national speed limit wasnt a lie. "55 saves lives and Gas"

[@turbo_brian]

Actually the most efficient thing to do is to "cycle" where you moderately accelerate and then coast. So if you're on the freeway and want to go say 60 mph it's more efficient to slowly accelerate up to say 65 then coast down to 55 and repeat this over and over. Super annoying, but more efficient. This is because your engine has pumping losses associated with the throttle plate being closed so running it more open when you are using fuel improves the engine's bsfc and then coasting uses effectively no fuel. It's also super annoying to ride in a vehicle doing this.

[@drippingwax]

​@@turbo_brian I called that leapfrogging when I bought my first car in 2000, but I decided it wasn't worth the annoyance. Hypermilers call that pulse-and-glide. It is especially helpful if you do engine-off-coasting, but I don't know anyone who does that anymore.

[@drippingwax]

I have always timed lights. I never understand everyone else speeding to reds and then braking when it is obvious they cannot possibly make it. I almost always slow down for a light before the vehicle in front of me. It is always fun to roll up to the light and pass someone who cut me off.

[@poleosis]

Regarding "windows down", mythbusters also tested this one not once, but twice. While windows up will always be better, if you need cooling AC is NOT always more efficient. Below 50 mph, windows down is more efficient than running AC, and above 50mph, AC is more efficient.

[@Pain9682]

This is exactly what I thought when I saw this, lower speeds just doesn't produce enough wind reisistance for that to be efficient. I wonder how effective it is at different temperatures outside though..

[@TheAlbaniaGaming]

I always wondered this, and logically thought so, that when you went highway speeds is better to use AC (espcially considering the wind noise) and in lower town ones its better to open the windows, you can also hear better around you. Now i have it confirmed.

[@geemy9675]

@@Pain9682 exactly. it depends on a lot of factors. how fast you're going, how long is the trip, how much you're opening the windows, and how hot it is outside. also if you have big windows, glass roof, ac is working much harder to maintain temperature. if outside temp gets close or over your body temperature, so high 90's, the more air gets in, the hotter you get. driving long distance on the highway with broken ac and 100+ F REALLY sucks trust me. but if you consider comfort/gallon AC clearly wins unless outside temp is nice

[@matthewmiller3392]

Dependent on the A/C unit. Many modern A/C units have the option not to compress air while you are accelerating, only when coasting - they’re almost an energy recovery system. And certainly, keeping the windows up results in less loss of that nearly free cooled air.

[@Insanias]

the below/above 50mph may be true, however if its too warm outside and you arent getting much cooling from windows down, may aswell just keep them up and use the ac to get a temperature and turn it off. dont lose the cold air by opening the windows again because when you close them you'll have to use the ac to cool the car again

[@danielorr6576]

I'm not even a car guy, but do love this channel, got my cousin a car guy watching you guys, I think we need to put Jeremiah brain to the test.

[@N0ENEMIES]

When I was a kid I used to tailgate tractor trailers on long drives and the difference was astonishing. I could use about half the throttle I was using before I starting drafting off of the truck. You gotta be like dangerously close though. Terrible idea but hey, it was for science.

[@jonscot8393]

Same here at night, never used head lights from about 50 yrds out so not to freak out driver of truck but after about 30 minutes at 4 ft out my nerves were shot. as you say, for science. I'd put it up there with Russian Roulette?

[@SlyNine]

One time that truck goes over something your car can't. All that saved money is gone

[@motohrs2835]

I’m actually Truck driver and i hate when cars tailgate me so i always slow down on purpose to make them not to tailgate. it makes me think troopers following me cuz i can’t see the car

[@dhag72]

@SlyNine a moose or deer make one hell of an "instant speedbump" thats for sure. Especially when its "flung" in the air by the semi

[@rootz420]

Idk the way I look at it is you got a huge shield in front of you that cannot stop faster than a car can stop. The semi would plow through whatever obstacle and you could slow way down.

[@rcmike09]

For the obd2 fix, someone that actually knows how computers works, went through the "micro chip" and found ALL it did was blink the leds. Only 2 of the prongs actually had power going to them. One positive, one ground

[@rob_over_9000]

Yeah honestly you don't even need more than a rudimentary understanding of basic circuits to pop it open and see. The 12V and GND pins are always connected.

[@kingleopold6011]

The hero we deserve! Thanks !

[@anthonyfoster2784]

Placebo effect is real, if you believe its making a difference you will see results your hoping for.

[@archygrey9093]

@@anthonyfoster2784 Plus when people plug in these devices they start driving like grannies and then get amazed at how much better economy they are suddenly getting, so they actually are getting better economy but only because of their driving habit change

[@easymoneysniper9013]

It would be easy to tell it doesn't worn eco modes just change the shift points so it shifts faster than sport which holds the gear longer if you didn't see a change in shift points it would show its a scam

[@benpeterson7530]

On the automatic vs manual. Manuals usually weigh less (sometimes by a lot). That can make a difference.

[@Veikra]

and no pump losses

[@MetalLead]

@@Veikra Also when idle at a light or whatever the engine does not have to spin a heavy torque converter the whole time, and if you are downshifting to coast down a hill using engine compression that whole mechanism is more efficient. Autos usually use a lot more fuel if you don't bother downshifting in that scenario though for the same torque converter related reason. Most people don't downshift in autos and just coast and use their brakes down mountain passes and the like which means the engine has to use a small (similar to idle) amount of fuel to keep spinning the torque converter ready for you to press on the gas pedal. Doing this will make a difference on mpg going down a mountain, the same reason that you don't want to put your car in neutral going down a hill as some people think works. A good rule of thumb is that if you are speeding up at any sort of bike-like coasting rate while coasting down a hill you will be using a bit of gas in the engine, even in a manual. Manual drivers are simply more aware of this since they shift all the time and a manual car ecu will be truly putting 0 fuel into the engine in this downshifted, slowed by the transmission state. There have been many times (I live in a state with many mountain passes) where I have gotten 10-20 more mpg on a trip than I should have taking advantage of this at every opportunity in my manual car by simply sitting in 5th gear instead of 6th which maintained my speed down a hill. An auto with way more gears than a manual will obviously completely negate these negatives though like they said, just from general efficiencies during normal driving and depending on where you live and how flat it is, could make the hill stuff totally irrelevant. It's an almost negligible difference unless you don't downshift your auto anyways. If the road is not downhill or steep enough to keep speed constant or it is very steep (aka you are speeding up or not speeding up much while in the top gear), then there is actually a quite-complex optimization problem involved in determining whether coasting with a gear engaged and fuel cut or disengaging the engine and using some fuel to idle is more efficient, and a modern car with an automatic or automated-clutch gearbox will actually be evaluating conditions at all times to determine whether to activate a special "coast" or "sailing" mode where the gearbox is placed in neutral automatically and reengaged when power is requested again. This is the state I am talking about with an auto where it uses some gas going down a hill. It has to keep that torque converter running while it is doing all of this, and the computer has no idea what conditions it truly is in, unlike the driver. I guess what I am saying is that you should totally downshift your automatic cars and let the ECU know what it should be doing instead of cycling back and forth from idle back to engine compression. That's what the lever is for! Your wallet will thank you.

[@immatricule6900]

So I did the test, driving behind a semi for 30 miles. My MPG went from 27 to 41 MPG ! This for 2 reasons : - resistance of air highly reduces - the semi force you to keep a steady and limited speed Anyway, I will do it more often now, hope to not kill myself in the process.

[@mihirkarnam7350]

Justin really is a dope new addition to the donut team, love to see him get more comfortable infront of the camera!

[@xherta]

yeah i think this is his best video yet

[@Asymmetrical-Saggin]

@Don't Read My Profile Photo You really need attention that bad? Ok... I read your fucking name.

[@BramH...]

Agree 100%!

[@CodySmith-ks5it]

His voice kinda reminds me of hert from hoonigan

[@stott2hot]

@@xherta and he’s been p good the whole time, definitely a great addition

[@zeroforcemember]

The ecomod would be a great series. Myth busters also did an episode where they used a bunch of clay to make a golf ball dimpled car

[@trashbandit2449]

Did it work

[@Love2Cruise]

@@trashbandit2449 Yes, it worked as a proof of concept. They used tons of clay to create the dimples, so the car weighs a lot more. In steady state cruising, the dimpled car returned better fuel economy. In real world, that improvement would be offset by the additional weight of the car. It wouldn't be feasible unless you want to create dimples directly on the body panels.

[@drippingwax]

As XKCD said, Mythbusters isn't science, they fail at basic rigor. They do fun experiments, but they often commit basic errors. As MadisonMPG said on the Ecomodder website in 2009, they claimed an "11% improvement on gas mileage with a dimpled car." They did 5 one-mile runs at 65 MPH and claimed they went from 26.x MPG to 29. They switched to a separate fuel tank, which they weighed before and after, so that was good, but only 5 miles? In the same thread, Darcane pointed out the amount of fuel that would be measured roughly would have been 11 grams of fuel. Also, a basic concept on Ecomodder is A-B-A testing, so they should have replaced the dimples to see if they still got 26.x MPG or if there was another effect. They made 1,082 dimples, which took several people hours. It is entirely possible that other factors changed. One of the administrators of Ecomodder, MetroMPG, who has done extensive modifications, and substantial testing, pointed out that they didn't use cruise control, Jamie tried to hold his foot steady. Could human error cause an 11% variance? Hopefully not, but there are many variables here. One thing that MetroMPG has done extensively is tuft testing. I want to see how the air flows differently and this is infinitely cheaper and accessible than a wind tunnel. How much do yarn and tape cost? He also checked their math. Adam said they used 503 g on the clay car and 478 g on the dimpled car, but that is only a difference of 5.2%, so they fail at basic math? Someone else pointed out that they relied on Jamie changing tanks when they passed the start point. That also allows human error. We didn't have test data like temperature, wind, full drivetrain and tire temperatures, etc. Ecomodder has a physics professor named Aerohead. He said that if Jamie is an engineer he should have remembered that the Reynolds number states that dimples don't work on an object larger than a golfball. Also, dimples work on golfballs because they spin. Aerodynamics are different on non-spinning objects. In "Car Aerodynamics - A2 Wind Tunnel - Wind Camp Tech Theory" on MotorTrend's website, Gary Eaker, who worked extensively with windtunnels, stated "Golf-ball dimples [...] do not work on cars, regardless of the scale of the dimples, unless your car is a 1.68-inch-diameter sphere spinning through the air with no ground plane." I will believe his experience over television entertainment--or take the dimpled car to a windtunnel.

[@drippingwax]

Justin said he overinflated his tires, but then said that other characteristics worsened, and then somehow called the idea a scam. Just test this. Drive 20 miles at 65 MPH on the highway without traffic at 32 PSI, 20 miles at the sidewall maximum, and then another at 32 PSI. Then actually test these other characteristics. Don't higher tire pressures improve braking?

[@trashbandit2449]

@@Love2Cruise hail damage

[@NeoAutodroid]

As a long time Prius driver, the biggest differences in MPG I've seen comes from 1. Good driving technique (rapid acceleration and deceleration kill fuel economy) 2. Make sure tires are properly inflated. Underinflated tires lower fuel economy substantially 3. Weather (not really something you can control) with hybrid vehicles the drive battery is adversely affected by extremes in temperature. On really hot or really cold days my MPG can drop as much as 8MPG. 4. Drafting actually works well on the highway but you don't have to drive as close to large vehicles as you think. Just keeping a safe 3 second distance from large trucks improves economy over following smaller vehicles.

[@javierramos9795]

One clarification you should make is that “Top Tier” is not to be confused with higher octane, top tier gas is gas that has additives across all octane grades, gas stations without the top tier sticker at the pumps usually means that is just plain gas without the additives.

[@futureepix8801]

Justin did an awesome job hosting this episode. He seems so much more confident. Yet ANOTHER banger from the crew. Keep it up!

[@williamgallagher9891]

Justin is a forced addition that adds nothing to donut These bot comments, such as this one, are proof that they know this and are attempting to 'gas light' the audience into thinking there is actual support for this obvious shoehorn 🤡

[@MoonsOfEmpire]

Justin is fast becoming my favourite donut!

[@poppachoppa8956]

He sure is getting more confident, it’s actually cool to see the genuine shift from newbie to confident pro with the different hosts on the show as they join the team.

[@mgsPWlover]

It's so awesome seeing Justin get more confident in front of the camera, he's a great addition so far.

[@jassemalzahrani4502]

I would absolutely love to see an ecomod im trying to do this to my truck and would lobe to see what you guys go through also!

[@solarfinder]

I have to use higher octane, for detonation. Never thought I'd get better mileage, so I'm glad I educated myself. Good job guys

[@Simoxs7]

Don’t know about the US but here in Germany you get less ethanol in the higher octane fuels so they’re marginally better than E5 or E10 but cost way more so its more expensive in the end…

[@TheZXKUQYB]

They were wrong about top tier. Top tier gas is gas that has higher detergent it cost a couple extra pennies. Yes premium gas has, but it is all gas. It keeps your engine cleaner.

[@Arpan_akm]

Power petrol has a higher number of octanes than standard petrol. Power petrol reduces engine knocking, due to which the vehicle's speed and power increase. This is what we get for paying more for gas

[@davisfamily9510]

Would love to see an Ecomod or Aeromod car build! Could even have two cars and teams to compete with each other and see who can make the craziest and most efficient car!

[@leafrika6520]

💯

[@HenryMidfields]

Yeah! +1!

[@tomasoliverasala]

yesss

[@bigchillin9359]

Greatest improvement would be best, bc I like the idea of ecomodding a challenger

[@Gizmos_and_stuff]

yessss

[@Gervino]

love to see an eco mod, the cars always end up looking so goofy, i’d love to see how over the top you guys go with the concept

[@pauledwards9210]

Same!! Would love to see them eco modding

[@mattwilliamson1714]

Yes! Use a Gremlin… maybe turn the seats & drive train around and run it backward! 😂🤣🤣

[@craftyukraine]

That "style" looks like you want to pack your car to ship it somewhere into Uglycarland, for example.

[@Damologist]

I love Justin, he has great presence and personality, and is a joy to watch! :)

[@WAFERCOOKIES]

My all time record for MPG in my 2017 Miata RF Club manual with a full tank was 43. Something MPG. But I was coasting when I could and driving 55-60MPH on the freeway. This is with 77k miles driven on engine with 87octane.

[@lawracks]

I’m glad Justin’s taking a bigger role in videos, I really like him as the new guy

[@mattm4476]

Yea he's a solid member.

[@bczarrockbeast6264]

I agree.

[@mattm4476]

@@jayamburn1959 sitting in my toilet trying to push out my Taco bell I had for lunch. You?

[@NAPBAM]

Justin did a great job this episode. Please have him hosting more!

[@dave_id]

Yup, killin it

[@kennedycurran2494]

no offense but I didn't really like it that much

[@dropitlikeitshot815]

Installing that hydrogen cell looked like fun also

[@UpperDarbyDetailing]

Correction, if it says 87 you don't HAVE to use 87, but you're not getting any benefit. In SOME cars marked 91 you CAN use lower octane without damaging your engine, BUT it will have a catastrophic effect on your mileage. Which means more money in the long run, even if it doesn't actually damage anything. As for windows vs. A/C depends on how fast you're going. Around town, windows down is cheaper. On the highway, A/C is better for mileage.

[@alexislaisney3404]

Wrong If you car requires 91 then you must use 91. It will damage the engine

[@alexislaisney3404]

Dumbest Cracker

[@UpperDarbyDetailing]

@@alexislaisney3404 Yeah, don't actually say anything or attempt to refute my point. Just insult a stranger with nothing to back it up, because it makes your racist ass feel better.

[@UpperDarbyDetailing]

@@alexislaisney3404 that CAN be correct. However, newer cars retard the timing to use lower octane gas without the predetonation issue... and they've been doing it for at least 15 years. Edit: Muhammad the Prophet had another reply, but since I destroyed his incorrect argument... he decided to be a coward and delete his comment instead of admitting his ignorance.

[@fitybux4664]

Windows down at low speeds is always better for the occupant. Not everything is always about mpg. Humans need fresh air. Carbon dioxide buildup in cars is real.

[@robertt9342]

The gas pump thing also is corrected to a temperature, 15 degrees Celsius in Canada. Also I believe the myth busters segment shows you can be quite far back from a semi and still have a measure able gain to mpg.

[@Slizzo82]

DEFINITELY do some sort of eco modding series! That'd be a great watch guys!

[@fantastic_mr.f0x]

Yes please.

[@yungboicontigo9278]

They should do that on a hybrid car like a Prius. Imagine if you add more MPGs on an already fuel efficient car

[@Dre_23]

Agree they should

[@rcintron123]

Please YES!!!!!

[@hotandnasty]

@@yungboicontigo9278 that or an Astro van

[@TheDonutMan3000]

The best trick would be driving slower. At higher speeds most of the engine power is used to overcome air resistance, which rises exponentially. Double the speed means quadruple the air resistance

[@lilkris3008]

You just need to find what speed has the best return on mpg. For most sedans it’s around 65mph. I drive a Prius and find it’s about 68mph behind a truck I can get the same mpg at 75

[@TheDonutMan3000]

@@lilkris3008 seems about right for mine too

[@thetheatreorgan168]

Noticed this with airplanes, they’re flying slower now because an extra 50-150kmh makes the plane eat exponentially more fuel relative before peaking at Mach 1

[@101Volts]

​@@lilkris3008 --- I remember hearing of considerable aero drag starting at or around 45 MPH. Not to say you should go 40 MPH on every road around, though.

[@lilkris3008]

@@101Volts this is true but at 45mph you aren’t going far. At 65 you can travel 100s of miles while only loosing 5-10mpg where as doing 70 would loose the same from 65. It’s diminishing returns you have to go highway speeds but you don’t want to waste any more than necessary.

[@Mrgoodtimes87]

Yes I would like to see all the videos that you guys described in this video. Keep up the great work. I don't believe that running the AC does not use as much fuel as having my windows down. I lose power in my 2005 Mustang when running the AC.

[@joshuagomez3600]

Lol yah the point at the end I think is the most valid. There are a ton of things that can VERY slightly change your MPG. But the biggest one is your own foot.

[@davidtaylor6772]

Tailgating a semi works. When I was a terminal manager for a trucking company, I had to head from Atlanta to Florida for a trip. I coordinated with one of my drivers and tailgated his trailer while in a Prius and got 89 mpg on my first tank.

[@richardidgaf8002]

I really loved this dynamic between them two lmao. Justin ripping up the windshield wipers as if it owed him money was hilarious.

[@colehartel7206]

Thwarting parking wardens!

[@FNESSE]

Props to Justin for getting into hosting his own segments and videos now. Great addition to Donut 💪

[@oscargardiner3168]

good video he has something new every time

[@jeffersonott4357]

Yea, it’s odd, all the hosts are entertaining. How bout a women? (Not saying they are discriminating, I worked in garages for a decade, and never worked with a women, so I’m sure they are hard to find.). But, may be entertaining.

[@JoeZelensky]

Manuals do get better MPG because you can run lower RPM at certain speeds, you can glide down hills, and they have less drivetrain loss.

[@nolesy34]

Lighter, less load on engine, no need to have a stall converter Pity its too much of a chore for some

[@dominiqueeybers9186]

Agree with the ldv tailgate. But what we have experienced was a trailer we had hooked behind a car. Was huge difference in performance and fuel consumption.

[@drache444444]

theres a few mistakes here and there. overinflating your tires by around 10% doesnt create uneven wear and also doesnt ruin your handling, but will do a tiny bit of fuel saving. just dont overdo it. better gas -> here in germany we have 5% ethanol and 10% ethanol gas. the price is so close that calculation wise it doesnt make any difference, but my dad uses around 5% more fuel with it being only 2% cheaper. i dont recommend the 10% based on that. cold and hot gas at a gas station -> of course the tanks also heat up a bit. every gas station that i worked on could check the temp of the stored fuel at any given time, and in summer the fuel actually had a temp difference from night to day. 40°F during the night and up to 52°F during the day. but the pumps are actually programmed to take that into account while selling. here in germany they are calculated to measure what volume the fuel would have at 68°F and they account for it being colder and thus taking up less volume removing side mirrors -> mercedes measured during the 80's or 90's that removing both sidemirrors would actually decrease aerodynamic drag by around 15%, which is ginormous. thats also why most new semi-trucks here in europe actually have side cameras instead of mirrors. modern mirrors most likely cause a bit less drag than what merc measured back when they did, but still you shouldnt remove your mirrors for safety and legality reasons. also cars without mirrors look weird. auxilleries -> AC is a very big one, which can dependign on your model take up to 5% of your total cars power, especially in economy cars. but lights for example were measured by volvo -> they couldnt measure the difference between regular light on and off on their testing track. keep your lights on guys. if you have a biiiiig aftermarket stereo tho, keep it down, that will eat energy and with that fuel. and now the big one; transmission -> most cars and/or most drivers will drive more efficient with an automatic. you cant be as precise or as quick as an automatic gearbox, even if youre a racedriver. they banned automatics and cvt's from f1 for a reason. but, and thats a very small but -> if you have an econobox and you know the speeds you need, and the gears line up with your needed speeds, and you are very very good, quick and consistent with your manual gearbox you might safe a miniscule amount of fuel as manuals are mechanically more efficient in transmitting the power and are generally lighter. this all falls apart the moment you do anything outside of these gear ranges or even start to drive more sporty with a lot of gearchanges. but rolling on the highway with a fixed speed the manual can be more efficient. thats the case maybe 2% of the time. works for my dad with his driving style and commute, doesnt work for my mom with her driving style. sooo there is a tiny spec of truth even today. but if you go for efficiency in all situation a CVT is actually the best, as much as it hurts us car guys.

[@peterdarr383]

They also got the air circulation in the pick-up bed wrong - - beer cans migrate to the front.

[@partyman6666]

I agree with most of this. There are tons of flaws and left out considerations in most of the conclusions that they came to in thus video. A really big one is that you can't use a scangauge as an accurate way to determine changes in fuel economy that come from modifications. The best way is to fill up at a pump without topping off, drive, then fill up at the same pump until the pump auto shuts off when full and divide your miles driven by volume of fuel put in. Establish a baseline by doing this before the mods then again after your mods and with similar weather, traffic conditions, driving habits and routes and compare the results.

[@Wheagg]

We got e10 here and e15 now whether we like it or not haha

[@drache444444]

that sucks tbh i remember that my old moped didnt even like e5 and i had to pump the v-power or aral ultimate stuff for it or it would sputter and be down on power.

[@Wheagg]

@@drache444444 yeah but if you need it there are ways to get more "pure" gasoline from hardware stores and stuff. America is weird like that.

[@EconomicsMate1]

No matter what hack you use, at the end of the day, Clarkson said it best: "It's not WHAT you drive, it's HOW you drive"

[@roducliaharenvol8302]

If I remember correctly he was comparing a BMW and another eco car. I believe he was driving the BMW in low rpm or perhaps another method he used

[@jaskajokunen3716]

@@roducliaharenvol8302 Yeah if you drive high performance car "normally" You can be as economical as a prius

[@EconomicsMate1]

@@roducliaharenvol8302 correct. It was the BMW M3 vs the Prius. The Prius was going full blast and the BMW was just keeping up. And the BMW had better MPG

[@candle_eatist]

@@l4g jokes on you I don't have to

[@tomaskysela5523]

I'd say What is pretty important. At least in Europe the rule of thumb is if you wanna have fun drive. If you wanna save money, use public transport...

[@TheStrawbunnyPrincess]

XD I used to love manuals for snow driving. in the 90's I felt like I had a ton more control in the snow when I could shift, but as tech got better... the advantage vanished

[@craigcampbell8560]

Manual transmissions still have an advantage when it comes to control, meaning you can hypermile better with them as well. That said, you have to actually try to hypermile for it to be an advantage. Most people driving manual transmission cars these days are more interested in the one HUGE advantage they will ALWAYS have over automatic transmissions which is they are a lot more fun to drive. Even econoboxes can be fun to drive with a manual trans.

[@igorokinamujika2073]

@@craigcampbell8560 Important to note that people outside of the US don't necessarily use manuals for fun. I certainly don't.

[@macbuff81]

Slush box autos in the past used more fuel since they designed for smooth transitions. They also usually had three (four with overdrive) gears making them less efficient. Newer dual clutch transmissions have between 7 to 10 gears allowing for very efficient gear ratios

[@TheGoddamnBacon]

Not to mention, they not only were heavier both in static AND dynamic weight, but also many didn't lock at highway speeds.

[@seshelbow336]

I like how you bust all these myths based on how you feel rather than actually testing them. Science 👍🏻

[@sirjolly81]

other people have done these test. You can snap your wipers and mirrors off if you like and post the results.

[@sicjoubert]

Agreed, the problem is the title "Testing Fuel Economy Hacks" but they only tested one. Using mythbusters for an example, I remember they tested AC vs windows but they did not show that even. Results were lower speed windows, higher AC. Expectations were them testing the myths not just talking about it

[@siamanspaps]

@@sirjolly81 then any other hypermiling project does exactly that…

[@r4nd7r04d5]

"Based on how you feel"??? Dude, you have to be braindead to believe those 'hacks' gave any result

[@thanosianthemadtitanic]

Use your head most of these just sound stupid

[@foxxifi6521]

i would most definitely want to see an eco modded car, that sounds very interesting, especially if you can get gas mileage over 50 at least, that’d be super cool to see. I also would love to see jerry make a hydrogen powered generator for a car

[@oldjeeper9174]

Testing hacks without actual tests- this is a new level of science!)

[@deplorablerach]

other people did the tests they're quoting them. that's efficient

[@Icytits]

A major contributor to auto versus manual fuel savings was the torque converter slip. Modern vehicles will use a locking torque converter or dual-clutch to prevent that power-loss, thus increasing efficiency. That wasn't super prominent though until about a decade ago, not so much 50 years ago. The more you know!

[@MustachioFurioso9134]

Yes! I'd love to see the Donut crew take on an eco mod, and 100% should be a stupid inefficient car like a hellcat or something. Would be hilarious and fun to watch

[@NoHanLuke]

Not even lie. Sometimes I watch old donut videos to make me laugh or to cheer me up because when I was homeless and living couch to couch this is really the only thing besides making music that entertained me while going through those struggles. To this day it still brings me happiness to watch the new shit you guys are posting. Please keep at it !

[@herbosmoker848]

Seek Jesus.

[@snapnclap]

@@herbosmoker848 bro what? This dude is just posting a nice little nostalgia story

[@allhall0ws]

@@snapnclap think he meant it in a nice way

[@torinnbalasar6774]

Didn't think about different gears for efficiency (probably because I'm not old enough to have experience with lots of older cars with manual transmissions), but I believe that a lot of older cars were a lot lighter because of building material/design choices that aren't acceptable anymore due to crash safety, and reduced weight would improve efficiency.

[@joshm3342]

Mistake @8:42: It's true that using high OCTANE fuel where it's not required is wasteful. TOP TIER GAS (toptiergas.com) is fuel which is certified to have the correct additives & detergents to keep your fuel intake system clean & properly functioning. May not affect mileage, but ensures that your engine will perform correctly, produce full rated power, and require less frequent repairs. Use Top Tier gas and skip the fuel injector cleaning, etc.

[@steampunknord]

I would love to see an eco themed high low. Even if it's not one where you make two eco cars you can still have fun in.

[@devonlambert9131]

Like a high low with two of the same car but modded for power vs economy? That would be really cool

[@steampunknord]

@@devonlambert9131 Well I was more thinking both modded for power while being economical but that would be awesome too. Cause we don't necessarily have to forgo power to be more eco..

[@Arellanog123]

I would too

[@Matt-vz5wy]

Just buy a Honda with a b series. Feels faster than it is, and stays fun to drive.

[@williamlevy1630]

Love to see a hydrogen fuel cell build with Jeremiah and an eco mod build with Nolan. A face-off to see who achieves the best fuel economy.

[@Just_A_Little_Kit]

I LOVE that Cabrio❤️ the most fun project car I’ve ever had was one of those I got from a junkyard🥰

[@ericwong1265]

On the tire pressure myth, overinflating your tires won't reduce friction. Friction is the product of the normal force (the force pressing down from gravity) and the coefficient of friction (F = N * cF) Lowering the surface area in contact with the road doesn't reduce friction because it doesn't lower the normal force. The area in contact is lower with overinflated tires, but the pressure per square inch is higher so friction per square inch of contact is higher.

[@skiskicmb]

Good to see that Justin got in the groove and got his confidence up! Now he is matching the energy level of the entire crew. Good for you Justin!

[@ImDying2Live]

For sure, I didn't care for him the first video I saw him in, but He just seems like one of the regulars now and is great!

[@DoubleSmackJacksSmackAttack]

I'd love to see an ecomodded 80s or 90s brick pickup like an F150. I know the hypermiler guys have used rangers before but one of those 12mpg V8 bricks would be amazing to see the benefits on.

[@oscargardiner3168]

I would also like to see

[@quarkonium3795]

Even more insane, ecomod a Mercedes G-class 6x6

[@jprme7588]

@@quarkonium3795 Ok that's just silly

[@guysumpthin2974]

Slip stream will usually cause the driver to have elevated Co2 levels as tested in autopsy of crash victims (reported by insurance company metrics)

[@keijimorita1849]

I have a 94 suburban with laser iridium plugs, tires inflated to max (50psi), crank fan removed & timing advanced. Haven't done any precise measuring but I know I'm getting better mileage because my needle moves slower & I'm paying less for gas because I'm using less. It's my work vehicle & daily driver.

[@danfigac8918]

Absolutely do an eco mod. My stepdad traded his 96 GMC Suburban for a 96 Geo Metro during the Great Recession and we loved that car. He loved it so much he bought a second one. A 1991 4door automatic.

[@eliansalinas7022]

If I’m not mistaken, the HUGEST way to save on gas is by driving conservatively. Not super fast, maintaining continuous speeds, just super consistent driving will save you TONS of gas.

[@FinnFann]

Yep I saw 5-10 mpg difference going 70 vs 60 on the highway personally. Part of this was 70 was harder to maintain without being more aggressive. Biggest gas savings unmodded is just being gentle on the vehicle and letting it pace itself.

[@NothingXemnas]

10:44 Adding to the talk: running the AC is more efficient if you plan on driving consistently above 40mph. In the city, window down doesn't affect fuel efficiency that much because the car is rarely fast enough for the aerodynamic drag to be so strong, so this tip is mostly for people who use highways for travel or work.

[@davidg4781]

Years ago, I had a 1 hour commute to work, mostly on the highway. When my ac went out, I drove with the windows down and saw a 2-3 mpg benefit, more in cooler weather. It might be dependent on the car, mine was a Ford Escort ZX2.

[@2A_Tree_Hugger]

Would it be safe to assume it also depends on how far your windows are down? Because of the amount of power my AC saps from my low HP motor, I usually crack the windows on the highway instead of running AC.

[@davidg4781]

@@2A_Tree_Hugger it might. My unofficial tests were between windows up, ac on max (I’m in South Texas) and windows down, ac off. Your mpg would probably be higher with windows mostly up, ac off.

[@McBenjiBoo]

@@davidg4781 Where you running your AC constantly when driving? One tip is to turn it on, get the car cool, then turn it off and use recirculation to keep the cool air in the car.

[@16driver16]

A 1.0L car will see a more drastic drop in mileage than a 6.0L+ because the engine will hardly notice the A/C compressor at that point. Also different size cabins to cool

[@patrickdougherty1981]

Definitely wanna see the eco mods on a crazy car! And can only imagine what Jeremiah could build would love to see both! ! You guys rock watch you every night keep the good content coming!!!

[@chrissinclair4442]

Ecomod, yes. Employee blowing them selves up with a hydrogen bomb, YES! Never heard off an HHO, but I would use distilled water. Wonder if it would cause more corrosion in the cylinders?

[@101Volts]

Well, you could also hop over to Ecomodder to see some of the things they've done. There's a pretty good thread about the "Aerocivic," a 1992 Civic that was heavily modded. There's also one about a 14 MPG Semi Truck that has a lot of aero mods.

[@peterkincaid6406]

@@chrissinclair4442 SORRY BUDDY. IT IMPLODES . IT IS A PURIFYING FIRE AND IS IN FACT IT IS THE PURIFYING 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥 THAT PURIFIES ALL THAT IT COMES IN CONTACT WITH IN CLUDING URANIUM WASTE . MY FRIEND YULL BROWN HAD HIS RUNNING ON ABSOLUTE MOLECUL HYDROGEN 1,000 K TO THE GALLON. PURE WATER VAPOUR FROM RESIDUAL PURE FUEL ! I FIRST MET PROFESSOR YULE BROWN IN 1987. OBVIOUSLY YOUR BUDDIES ENGINE WAS NOT CONSUMING. NOT ABSORBING THE MOLECULAR HYDROGEN BECAUSE OF THE DIFFERENTIAL PRESSURE !! IE. HOW COULD I GET INTO YOUR HOUSE. .. IF I COULD NOT ENTER IN. AND IN FACT IF YOU KNEW WHAT HAS BECOME CALLED BROWNS GAS WORLD WIDE. YOUR PERSPECTIVE ON LIFE AND OUR FUTURE WOULD ALTER IMMENSELY. ! AND IN FACT THE WORD ALTER BECAME A LIFE TRANSFORMING EVENT IN YULLES LIFE BULGARIA AT AGE TWO !! P.S . THERE IS A MASSIVE CHASM BETWEEN THAT WHICH MAN SEES. OR DOES NOT. AND THAT WHICH HE KNOWS. .. AND DOES NOT !! GOD BLESS !

[@yashsvidixit7169]

I have eked out 59 mpg from Hyundai i20 with a 1.2 litre NA engine. The key was to be gentle and use the momentum as much as possible and avoiding having to brake.

[@BirnieMac1]

Holy crap the By Release music had me double checking what video I was on A runescape reference on a video about scams is super fitting

[@gunshotmike]

Finally, Justin does his own episode. So cool to see this. And he seems more comfortable in front of the camera.

[@pauldauria5689]

Really cool to see Justin come into his own and take the lead on this video!! Was skeptical about how much I liked him compared to the other guys, cause yall are all so awesome! But after this one I love seeing his personality and what he has to offer! Cheers guys, thanks for another great video!

[@johns9652]

That turbo thing, I remember infomercials pre-Y2K for something called the "Tornado", seems like the same product. Over-inflating tires. I'm torn on that one, I used to make a practice of inflating my rear tires to manufacturer's suggested, which was usually 32 PSI, and my front tires to slightly above, like 35-38. The idea being that most of the vehicle weight was in the front where the engine is. Not sure it made a difference, but I believed in it back then. Honestly, the biggest difference I ever saw was when my old Nissan Sentra's exhaust rusted through. It was a California model, with 2 catalytic converters, one under the engine compartment, and one in the rear in a more traditional spot. Once the whole exhaust system fell off, and I had to put a sheet of scrap medal under the hood for a heat shield to counter the growing paint blistered spot, the MPG went from 36ish MPG to 39-40ish MPG. Gas and temperature. Ok, there are a number of flaws with the statement that this is a scam. One being that at least at one point in time, certain times of year were when the government mandated ethanol be used, so at one time of year you might be getting regular gas, and another time of year the 10% ethanol variety. Nowadays 10% is year round as far as I know, and now even 15% ethanol is available, which averages around 30c a gallon cheaper. Can't use it in vehicles before 2001 though. Or in lawnmower or snowblower type equipment, you will damage the seals. Most importantly though, if there is no difference in the temperature to gas performance, why do all the gas pumps have labels on them that tell you that "The energy content of gasoline varies with temperature" or words to that effect? I even dreamed up money making schemes where I would invent a gasoline tank heater, to increase the energy provided by the gas. My idea was to use a hot water heater, fed from the radiator, to prevent fire hazards while increasing the heat of the gas. To my dismay, when I started looking up the patent process, there were already many patents for such devices, with various degrees of success and failure, most of which had only a minor effect, if any. Or they were so hotly debated, it made one wonder whether they were abject failures, or being suppressed by "Big Oil/Big Three/insert Big here". "Junk in the Trunk". They obviously had fun with this one, but yeah. Definitely science. I've even seen other channels advocate for removing your spare, because you probably have AAA or some other roadside assistance anyway. I would never promote removing your spare. Some extremists even go all out, and get quarterpanels, hoods, and doors replaced with lighter weight items made of fiberglass instead of metal. "Manuals are more efficient". Much as it pains me to say, this was once true, but probably false today. However, manuals are an added theft deterrent for Millennial car thieves who can't drive stick. So I'm still a fan. Plus, the feeling of being more in control of exactly what your vehicle does is worth it. I hate driving an automatic, and trying to pass some slower moving vehicle, only to have the transmission downshift, the revs go high, the speed stays the same or only increases a bit. Especially on mountain highways like I have in my area.

[@originalname74]

I'd like to hear more about AC vs windows. AC increases load on the engine, and windows open increases drag, but I've heard below around 45mph, its more efficient to have windows open. I also increased 1-2mpg just this past week by turning the AC up a few degrees.

[@Dustinbuchanan76]

Yes to the Eco mod and yes to the HHO mod. I love seeing you guys build awesome things!

[@Megasteel32]

HHO does not work, no thank you. go to Project Farm and look at his thorough testing.

[@JSope505]

Eco mod!

[@manuelloureiro7076]

Eco Mod !!

[@Accion_y_Pasion]

I love that Justin is finally hosting he should get his own show he became an instant fan favorite

[@potatos_4_free]

And let's not even get started on his super cool name.

[@Doctor_HB]

Funny story. In Grmany we have a self called expert in fuel saving, Georg Plattner, he is a good friend of Hans-Joachim Stuck, former Formula 1 driver, winner of the 24h of Le Mans 1986 and 1987, winner of the 24h of Nürburgring 1970, 1998 and 2004 . Plattner claimed that he could drive from Spain to Austria with only one filling of his tank. Stuck said it would be impossible. Plattner won with an average of 82 MpG. After that Plattner challenged Stuck directly and both drove 1500 km from Berlin through the alps over 13 mountain passes to Kühtai in the Austrian Alps. Both in the same car model (Seat Leon FR Diesel). Not only Hans-Joachim Stuck arrived first at the destination, he saved a higher amount of fuel. Stuck had an average of 55 MpG, Plattner an average of 52 MpG. After it Stuck said that his experiences from the 24h races helped him a lot. Saving fuel at a high speed back then meant you could be out one lap longer.

[@snarkasticdouche3863]

They say by filling up as slow as the pump will allow, more ends up in your tank. When the gasoline flows faster, more evaporates, and is recollected into a special outlet tube that's inside the nozzle.

[@Romenamath]

I formerly wrote vehicle tracking software that measured your fuel efficiency based on 6D motion detection (for a fuel company who were going to award bonus discounts to efficient drivers). 95% of the penalty (as calculated by our mathematicians from experiments) came from brake usage. Maximum fuel efficiency for your vehicle below the speed limit (drag negligible, no excess acceleration i.e. wheelspin) is achieved by allowing yourself time to stop.

[@waldolemmer]

If you understand kinetic and potential energy, you don't have to do any math to realize this is true

[@thelostcause7983]

@@waldolemmer I think the part where the math came in for this guy was discovering that it had more impact than other factors, but otherwise yeah you right.

[@supra1jzed]

In road racing we use "lift and coast" when necessary and possible. Especially if it's coming down to the wire on extra lap(s) vs. pit and competition's positions.

[@KirkNorthrop]

This doesn't surprise me. The amount of people I see running "on the brakes" because they're too close to other cars is crazy. Keep back to the recommended and safe distance, and saving fuel becomes natural too.

[@gabemccoy]

"Top Tier" doesn't mean high octane/premium. Top Tier is a third party certification for gasoline detergent types and amounts. I've seen no data to show if it improves gas mileage or not. You're right that an engine needs the octane that it was designed for, but Top Tier is separate from octane.

[@drippingwax]

Top tier is less likely to get clogged up, but how often is that a real problem?

[@abigails4088]

I noticed an improvement when switching to higher octane in my old NA Miata I used to have. but go figure a performance machine would benefit from something like that XD

[@jmoyet]

@@abigails4088 placebo effect. If you're engine doesn't require higher octane fuel it will just burn it like regular fuel and not make any better use of it.

[@iamstd2]

@@jmoyet depending on age and environment, an older car could have enough carbon buildup that it actually increases compression in the engine to require slightly higher octane. However... 1. This is extremely rare and the engine is usually toast before it happens 2. Any knock-controlled engine management will just lower the engine power if this happens.

[@miked9986]

Doesn’t improve MPG but can help with engine wear and carbon build up.

[@Ic3manWaddy]

Who doesn't want to see a Hellcat get 100 MPG

[@redcorset]

Back in the late '60 my friend and I was coming back from Dallas Tx To Memphis TN. It was raining bad and we were in a Volkswagon beatle. A semi passed us and we had the same thought get up close to the semi and let it block the rain. But when we got close we actually felt the bug suck up towards the semi. I backed off the throttle and that semi pulled us from Texarkana Ar all the way to Brinkley Ar. Our hood was almost on the Mansfield Bar. He knew we were there and would flash his brakes if he needed to slow down. He always let us come back to him though. He finally turned off at Brinkley.

[@happybeagle13]

Please do more with Justin! You’re such a natural addition to the team. It’s like you’ve been there since the beginning. Keep it up boys!

[@dylan-nguyen]

One thing about the octane rating at 9:10 If you put 87 when you require 91, you’ll get worse mpgs and spend more on gas in the long run

[@chazeroni455]

YA. Came here for this comment. I believe It retards the ignition and/or runs richer to avoid knock.

[@1xBublex1]

smartass here - it won't only increase your mpgs but might potentially break your engine (if knocking gets too bad, although modern ecu comes with knocking safety modes where your engine is run rich to reduce knocking, which in even more modern cars needs a mechanic to remove (check engine light comes on), with moderately modern cars it tests for better fuel in a given period)

[@LinusAkaPano]

@@chazeroni455 This. The ECU will try it's best with what fuel you provide it. If you give it something outside its needed rating, then it'll try work outside that parameter, making it much less efficient.

[@LinusAkaPano]

In my BioPower SAAB i can run ANY %mix between gas and ethanol, and the computer will switch accordingly. (More % Ethanol, more HursPurs)

[@TheHenirik]

also because of computer controlled ignition and turbos (and to some degree injection), you can get a higher mpg on higher octane if the ecu is programmed right, but the consumption will most likely change less then the extra cost, and the change might only be on higher loads. its more likely you'll get a little bit of extra power, but again it depends on how the ecu is programmed.

[@BogeyTheBear]

I thought the fuel-saving advantage of a manual transmission came from the lighter weight and the more solid connection you get with a clutch versus a fluid torque convertor. In older automatics they even featured a torque convertor 'lock' option specifically for increased fuel efficiency while cruising. When you're up to highway speed and the transmission no longer needs to shift gears, the torque convertor gets 'locked' in place for more efficient power transfer. The book even says this will feel like an extra gear shifting in once you're at a steady speed.

[@sheeshulex]

I recently got my hands on a modern (turbodiesel high roof van) vehicle with the fancy instant fuel economy readouts, driving on a highways a lot: Semis are literally the worst thing to draft, they move slow as molasses, often group up into packs and randomly overtake each other and you can't see through them, they often can't see you as well. Often utterly unhinged, stay far away from them. It barely matters what are you drafting, it works mostly the same. Sedans, hatchbacks and other regular cars like that are best because they are easy to see around. Slipstream is a cone and reaches quite far - you can feel its effects from about 50-60 yards, it not only reduces the fuel used for maintaining speed by about 10-15%, but also makes you lose much less speed by coasting. Keep your car in the highest possible gear when coasting, don't switch to neutral or press the clutch: the rolling resistance might be higher, but engine disengaged from the wheels will use fuel just to keep itself running, engine connected by wheels to the road will keep itself turning just from rolling and will use no fuel. Petrol engines may or may not only do it on the downward slopes, but diesels do it everywhere. My petrol daily is too old for such fancy computers for me to confirm it personally.

[@kavenmendes]

Used to slipstream semis in my 71 VW Bus on road-trips. Helped immensely with engine load and fuel mileage

[@Trainboy1EJR]

Slipstreamed in a 98 Camry record 38.6mpg, I think my dad was only getting 26mpg. Slipstreamed in a 11 SX4 record 34mpg. The SX4 gets 18.8mpg at 70mph, facing the wind by itself. If I want to go over 62mph, slipstream is critical. Although if the wind is particularly sideways, nothing that can be done, and gas mileage is going to suck no matter what, and if it is super blowing in my direction, I have to keep the CVT in Manual 5 because it doesn’t have enough torque to overcome the wind in Manual 6.

[@TytoMobile]

Problems with the HHO generator: -Energy used for electrolysis comes from the alternator, which loses some energy in the process. -Electrolysis is about 30-50% energy efficient for turning water into hydroxy gas -The HHO is being combusted by an ICE which is a 20-40% efficient process. -HHO tends to detonate, not combust at a sociometric mix, meaning engine knock

[@jungobango4815]

Stoichiometric*

[@mr.m2gilane]

And adding to all that, I don't think the car counts that as extra fuel without messing with ECU. It still will pump in same fuel amount specified in fuel map and whatever extra you can add through intake, it may or may not make a little more power but not save from fuel expences. Basically a dyi nos? Thats why LPG devices have their own controller to cut off main fuel and run on lpg. If you just squirt gas through intake without any modification to software, it just burns with same amount of fuel and...well, may send some pistons to low earth's orbit.

[@CreeplayEU]

@@mr.m2gilane That's why it's only worth it to get HHO equiped cars from some specialized tuning shops that do it. As I've seen here on youtube, they have their own controllers for the HHO and they even tune the ECU so you get better MPG and a bit more torque and power since it's hydrogen, and they get pretty good reviews from people that use it for like 5 years. There is also a guy from like Slovenia who modified his old Renault to run directly on hydrogen from water and there are even some more lazy ways like directly injecting water with gas into the engine and get higher MPG and it actually works, but that doesn't mean it's good.

[@patheddles4004]

If you install an HHO generator and you manage to get everything right, which is difficult, then you're basically just modifying your fuel: - Higher octane rating (probably not much higher) - Higher combustion temperature: increased engine wear, but likely some increase in fuel efficiency. Note that this design is only using the hydrogen, and discarding the oxygen - with the oxygen included it probably would cause knock, but the hydrogen on its own should reduce knock. I'd honestly be pretty impressed by anyone getting a net improvement in mileage using an HHO generator. Fun fact: I have seen HHO detonated at modest scale. Australian army was running a mock battle at an airshow, and they were detonating 2L plastic bottles full of HHO to make sound effects for the field gun. Very dramatic, and turned the bottles into hunks of melted plastic. I definitely would not recommend mucking around with significant quantities of that stuff. (also HHO is technically what powered the Saturn V rockets, but that's a whole other story)

[@scrumpydrinker]

A few more problems, The units shown on these videos are too small to produce HHO gas in any significant quantities. Feeding the amount of HHO that they do would have no effect whatsoever. When these units are shown working the water level in the tank barely falls(and the tank doesn’t seem to hold more than a couple of litres) If anything was happening one would expect the level in the tank to fall rapidly. Electrolysis yields are dependent on current levels, automotive electrical system do not have the output to run any meaningful electrolysis units. Most importantly, would you be really happy to have what amounts to a fuel air bomb running around in your car. There is a good reason why oxy propane and oxy acetylene torches have two separate feed lines as the gases are only mixed at the point of use for very pertinent safety reasons. With HHO the fuel (hydrogen) and the oxidiser (oxygen) are already mixed and it only needs a spark for it to go boom.

[@juliansaiz5714]

I tried to make one of those Hho using mason jars, I can tell you it’s super explosive lol, made a crude setup in my garage, put it under vacuum put a flame to the other end and I watched the flame suck down the tube and blew up the mason jar sending glass shards across my garage with a Loud pop, sounded like a 9mm going off

[@kmkcorner]

Two things I think could be wrong. 1) I’ve heard windows down at slow speeds is better than parasitic loss from the a/c compressor. Once you get to about 55mph the drag created from the windows being down starts to become more inefficient than running a/c. 2) The manuals is direct drive where an automatic has a torque converter and consequently has more slip. This means that more of the energy created by the engine goes towards spinning the wheels as opposed to spinning the torque converter. Put simply more loss in transmission, making more fuel necessary to do the same thing. Now the modern automatic with tons of gears may overcome this by having more gear ratios that allow the engine to be in a more efficient rpm more consistently. But, nothing compares to the CVT which can keep your engine in its sweet spot basically all the time.

[@macedindu829]

As far as efficiency of manuals vs. automatics, the gearing is one thing, sure, but as I understand it, the main thing was the torque converter. It essentially constantly "slips" a bit. Even assuming exact same gearing, the automatic loses energy because the manual is functionally locking the engine to the transmission once it's in gear and the clutch is engaged. Of course, the dual clutch transmission solves that issue.

[@JeremiahReddy]

Modern (2010+?) hydraulic automatics solve this problem as well by supporting torque converter lockup in most, if not all, gears. (Example: Mazda Skyactiv-Drive is said to support lockup in all gears)

[@fwebe2871]

DCT don't solve the net energy requirement, as automatic transmissions in general use more energy from the engine upfront to even work, which a manual doesn't. The slipping TC (which isn't even used in every AT, some use an electric motor instead) is one thing but the real problem is the base energy consumption, which makes them less efficient especially at lower speeds and which can usually only be compensated with using longer gears at higher speeds, as you can't use those longer gears at lower speeds. More gears can also decrease the gear steps, which reduce the overall rpm (and thus increasing engine load), when being light on the gas, but this usually won't compensate for the base consumption. Those transmissions usually use 8 gears where a manual uses 6 and have an additional 1-2 gears as overdrives. More gears increase the base energy consumption and the weight as well. There are other benefits to automated transmissions but efficiency isn't. For example the shifting strategy is consistend, which doesn't mean it is better at all times. To be clear, automatic transmissions have improved quite a lot, which reduce the difference between them and Manuals to a point, where the driver's profile makes the difference. On top they offer more options for hybrid power trains, which can in return save even more fuel. On the other side they cost more money, as they require more materials, software and maintenance. Nowadays it's mostly a decision between upfront car costs or overall consumption profile. For example a lot of german cars aren't cheap so initial cost isn't that relevant, but neither are they overly efficient which makes consumption more relevant for the manufacturers product line. In the EU manuals usually are used in cheaper cars or as an overall option to save money, as an increase of about 10% in price usually won't compensate in fuel efficiency against a manual, if it would do so in the first place. Automated transmissions really had their time when the NEDC was used for official consumption figures, as this cycle didn't allow an efficient use of a manual gearboxes, but any automated transmission could use the highest gears available. For example only at 50 km/h you where allowed to shift into 4th gear, even if 5th or 6th was the overall better option, while any automated transmission was allowed to use this same 5th or 6th gear.

[@petertroep9085]

@@fwebe2871 wow good read with a lot of information. Where can I read more about this? I would also like to add that the wltp cycle also sees manuals as more efficient with makes the price difference between manual and automatic transmission even bigger in countries with carbon taxes on cars (for example the Netherlands)

[@jime8532]

I'll assume the goal of increasing GPM is to save $. (duh). Question though, How much more does that 8spd electronic auto cost versus what a simple 3spd auto w/locking converter, just old vac and throttle signals to control shift would be?, and how long will it take for that small change in gpm to pay it back? If it needs service/repair I'm sure any gas saving $ is shot to hell.

[@petertroep9085]

@@jime8532 the change is probably more expensive than the economic value of such a car

[@nuclear_legacy8689]

I've been a long time donut fan and just this week I got my license and my grandmas old Cadillac. Can't wait to apply everything I've learned from you guys. Thanks.

[@nickscarbrough9258]

Best of luck with the caddy! I know that's gonna be a fun ride

[@Makaya9s]

Please turn it into an American version of a bosozoku car. Everyone will either be scared of your car or impressed.

[@amsgamingandmusic]

Recently got my license as well- have bought an everyday car, now am buying a 1997 z28 camaro. I whole heartedly agree with you man :)

[@contraband1543]

Things gonna be wrecked in a month lol especially listening to these guys

[@nickscarbrough9258]

@@contraband1543 please take the negativity somewhere else man. Let the kid have their license and their fun

[@xdtjv2843]

The most sane option is to just drive speedlimits, be aware of what's going on around you and act early and smoothly, try and minimise the need for heavy braking and acceleration.

[@Cliffdog01]

You don't have to go as far as overinflation, but if you take it to the Max Psi written on the tyre, you will reduce the deformation. You can test this out on a Bicycle to see the effect. The most important thing to Maximise fuel economy is keeping your car as clean as possible and removing dead weight. If you go to work daily by yourself and already have 2 cars, try to get a light sportscar like a Miata (or motorcycle) as your commuter vehicle. The next most important is controlling Acceleration and Deceleration. Even if you are in an Automatic, try to lift and coast rather than brake (where safe), especially when you come up to a Traffic Light that you know will change. Keep the momentum rather than race to stop at the light unless you have to accelerate like a Diesel. I started using these Hypermiler Fuel saving tricks a few years ago, and I've halved my fuel bill.