I use midgrade and get about 20 mpg in my 03 silverdo with the 5300 engine when on the freeway. local is drops to about 17mpg. stock tires with cats.

The IS prefers premium but will operate okay on regular, though if you throttle hard the engine will pull timing & run rich, so you lose top end & your MPG is worse. However if you tried to use regular unleaded on high pressure performance turbocharged cars (e.g. WRX STI or CLA 45 AMG) then be prepared for serious knocking or expensive repair bills.

Premium fuel is required not optional for this car. It is designed to run at that higher octane, the computer has to reprogram for lower octane fuel using the knock sensors, it decreases power and WILL make your engine die sooner.

Litters / gallon per 100 km or 62 miles is a much better measure of fuel mileage or economy as it measures how much fuel you need to cover a certain distance whether its up hill or downhill, loaded or unloaded it will apply to every ICE vehicle.

No,its bad for all engines,just a payoff to big ag

E85 actually made my 2007 Impala a bit faster

Ethanol free gas will easily boost mpg by 20% or more. Thats been my experience. 2017 Ford Expedition. I have gone from 14.6 to 18.9……Ethanol sucks.

Most of the E85 coverage is crap. Just like this one you’ve never used it after putting “this stuff in it”. Pure BS. Don’t pay attention to anyone without experience!

Is it worth waiting for any gas to damage your engine.. I've talked to many mechanics and they recommend premium fuel.. Good Luck..

Absolutely. My Kia Soul got about about 30 around town with but 34 with non-ethanol. My vehicle only ever saw a coupla tanks of ethanol.. one originally from the dealer and the 2nd from me when I checked the mileage. Then I ran a few tanks through with non-ethenol before checking it again with non. Another big thing is if you plan on keeping your vehicle for years after its paid for you do NOT wanna be using flex in that vehicle! Why? Because ethanol attracts water BUT your fuel system is not very big on that stuff.

My 9th gen impala is an e85, but I've been using regular gas. Idk if my leak from my purge valve has anything to do with it, but i changed the purge valve out, but my engine light was always on. I started to use e85, and the engine light went away so far. Im going to put an oil catch can in, and with the PVC valve, im going to drill them 3 holes to make them a little bigger. Im goi g to start usi g the recommended oil, and the oil filter that chevrolet wants to use on these cars.

You put premium in the car, this test doesn’t make sense??…

You don’t just hollow out a cat. Doing that could cause the contents of the cat to get sucked back into the engine. 😂

i have a 2013 impala with a flex fuel 3.6. these cars have 2 tunes. one that runs with standard fuel and one with E85 they both run learning the drivers driving style. The gasoline is test driven and set from the factory but the E85 takes 100 miles of driving to set the driving style. if it tunes from a led foot it will be more responsive and allow more immediate power. if you granny drive, the tune it will learn to cut power and accelerate slow. It does have adaptive learning so if you start lead footing it it will relearn and will pump more fuel and respond quicker. all newer cars have adaptive learning and flex fuel cars have 2 tunes and fuel maps that self configure. Drive how you want it to react and 100 miles later it will retune. Sometimes quicker but its recommended up to 100 miles.

Some premium gas is ethanol-free. This is mostly a regional thing. If your premium was E-0 and your 87 octane was E-10, this would also cause a discrepancy like this. Did you verify that both fuels contained the same ethanol concentration?

I check my odometer by comparing to the mileage markers along a long stretch of highway. The markers are supposed to be accurate. I’ve found that different brands of tires will vary by up to in inch in diameter size. Best to make a simple wooden caliper and actually measure diameter. Also tire pressure variance will greatly affect fuel consumption. Also to be considered is whether you’ve gained elevation during your drive . An increase of even 200’ over 50 miles will make a noticeable difference in fuel economy. Make sure to travel the same stretch of road when doing your testing. I’d like to see you incorporate all of theses factors into your calculations and see your results.

It seems that nobody realized that he used the gas filler nozzle to hit the 92 octane button before he started filling

Mileage and performance are not the primary concerns. Ethanol is poison to car engines, and engine repairs are expensive

Both of those codes, will affect your gas mileage. These will cause the air to fuel ratio to be off.

My 83 Lincoln mark vi gets 13 on ETHANOL and 20 on non ethanol in town

🙂☕👍

Where the hell do you live , I pay 3.05 a gallon

my 08 on E85 average dropped from 25 MPG avg to 17 MPG avg

You don't have to use Premium or Regular pick the one in between.

If you have a vehicle that says premium fuel recommended then you will see a difference in MPG and performance when using different grade fuels. If your car was made to run strictly on 87 then it will handle every fuel you use as if its 87 octane.

I've been running 87 and mainly 88 (e15) for a year now in my 2014 is350. Majority is on freeway and I have not come across any malfunction, just slight reduction of power (can still accelerate to pass cars as needed) and mpg is close to the same or sometimes even better if I drive at speed limit. I've floored a couple times with no issues.

my 2010 Dakota gets +1 MPG on E0 vs E10. (but the E0 is a premium fuel).

Just filled up my car with non ethanol gas and it runs better

Beautiful Lexus. I have an older model a 2009 IS250. I love it. I always put premium as I love her too much to put regular. I’m sure it would be fine if it was only one time and an accident.

I get 3.5 mpg better in my 2023 tundra trd pro hybrid with ethanol free … that’s huge

MPG I gave up on. Too many hills with stop signs at the top and bottom of the hill. No real flat areas in central Alabama.

Can i use 87 instead for this car?

I topped 28 mpg on the highway in my '18 Pathfinder on Valero 90 E0 gas. Some posts say it is Top Tier, but it very well maybe the same as Walmart. It did yield the best results.

Premium on a car that makes less than 200hp and isnt performance oriented is a market ploy to make manufacturers look upscale 🤣

Supposedly has 105 octane. And cleans the combustion chamber. Bad thing is blow by and oil contamination.

A nicely detailed and well explained video - thanks for posting and sharing. I run our tires about 10-15% over the top inflation (35psi --> 40psi) which seems to yield a bit better mpg too on our vehicles. All the best and God Bless. 🙏❤🇺🇸

I've always been told to put the largest tire you can stuff under the fender Wells regardless of the speedometer because you'll get more miles out of the tires heavy Vehicles eat tires. And when you go to sell it it has a whole lot less miles on the odometer. I like the way a vehicle drives if it has tires that are larger than they should be and the way it looks. Mexicans like to put on tires that are too small. A lot of used vehicles you buy with tires that are too small they did it cuz the price of the tires was cheaper. My 1970s cars run much better on non ethanol fuel and I'm not constantly replacing the fuel pumps the ethanol destroys the inside of the metal gas tank and the rubber dyer for him in the mechanical fuel pump when I switch to non ethanol the tanks had no internal rust anymore and the fuel pumps began to not destroy themselves at every 12 months. The car was designed to run on non ethanol gas. A lot of engine fires in small cars built before 2004 are attributed to ethanol gas rusting out the fuel system parts on the engine causing leaks. The metal fuel line injectors the ethanol attacks and destroys.

General Motors made these older cars to purposelly run worse power on E85/ethanol by programming the ECU to retard ignition timing despite being flexfuel vehicle. John Brackett exposed this in pump the movie(2014) by Josh Tickell.

Have you noticed a deference in cold starts since switching to ethanol free ?

hey c i’ve definitely noticed a difference between gas premium is the move

I've been running regular fuel on my 2IS IS350 since I got it with no major problem because we don't have access to premium fuel where I'm from. The only observation I have is reduced mileage (16mpg) and more carbon on the throttle body at interval.

how is ur mpg 28!?!? mine is only 14

If it doesn’t knock it’s ok. If you start to hear knocking you need to up your octane.

You would have to actually burn at least two tanks one after another of the same product to get a better reading just tlyk and fyi

Wow that Impala bumper you showed came out a lot better!

So it seems like you can run regular gas in this car. You just get more power with the premium fuel. I'm considering an 2006 lexus IS250. Wondering if it would be any different on that car (it's older, but it has the same engine)

Hey C's, Lexus recommends a minimum octane of 91 for the 2IS. I want to test out and use ethanol-free gas, but the closest gas station around here only carries it at 90 octane. Will this rating (90) still be ok for my 2IS?

This man going 90mph and people still passing him.

For my prado if I put regular I have the car engine knocking in acceleration mainly

Dat v6 sound 😍 0-60 video?