2024 GMC Sierra 2500 AT4X Real World Diesel + DEF MPG: Here's How Much 10k Miles Will Cost You!

[@CS-rb9jk]

Just did a 3wk 5000 mile trip to the east coast in our 24 LTZ Duramax with 2000 miles on the truck pulling 8500LBS -12ft high trailer. Averaging 70 to 80 mph @ 11.5 mpg overall. Used right at 10 gallons of DPF. Just came from owning Rams of 20 years. Man this thing is night and day different. My wife even commented how quiet it was, and we both agreed that even though the seats were more firm, In the long run they were better. We didn't feel any fatigue after long days. The Independent front axle is so precise and drives effortlessly. The 10 speed kept the Duramax pulling at 1100 to 1600 rpm most all the time, shifting quick and smooth and always in the right gear with great passing power. 8th gear is the same as 5th and 10th is the same as 6th in the 68R. 9th was great as it added 150 rpm which was just enough downshift 90 percent of the time The Banks I-Dash showed 32-33 percent DPF the entire trip with no regen. Exhaust temps 500-850 most of the trip. Used 1/2 quart of oil the first 3000 miles, and 1/4 quart in the last 2000 miles.

[@nascarace5854]

This man does a very informative honest review !!! Real world !!

[@rsbreeze]

That mileage is about what you can expect for mixed driving for a lifted truck. Anywhere from 15-18 mpg city and 18-22 mpg highway. Towing heavy, say 10-15k, 10-12 mpg. DEF consumption is spot on. Your gonna get 600-800 mpg. Maybe a little more under ideal circumstances.

[@TheOMEGANOX]

7500 miles on my 24 duramax, I’m averaging 12.5 mpg empty and 6.7 mpg loaded. I’m also running a 34.8” tire on the stock 18” wheel.

[@anthonyj810]

That sucks but it should get a little better once you break it in and get some wear on the tires. MT's and R/T's like ridge grapplers or toyo mts kill your MPG.

[@TheOMEGANOX]

@@anthonyj810 12k now no change

[@neualgo_systems]

Your ongoing truck info and reviews are BRILLIANT... love all the data you provide! I really really wanted to buy a 2024 Dodge 2500 Power Wagon (Green/Blk) but I need to TOW about 12,500 lbs (5th wheel RV) so I decided that I better go with the 2024 Chevy 2500 ZR2 diesel (Slate Gray) with all the towing/5th wheel options I will say though... the GMC 2500 AT4 interior looks waaaaaaaaay better than the ODD seat color shades and stitching color in the Chevy 2500 ZR2 I am really really naughty... so I will probably still buy the 2024 Ram 2500 HEMI Power Wagon for my daily driver and expense it to my Trading Fund ;-) LOL!!!!!!!!!!!!!!!!!!!!!!

[@rsbreeze]

My 24 HD ZR2 sits as high as my previous 15 LTZ with a 6 inch Cognito lift on 35s. They might call it 1.5 inches, but I think is closer to 4.5-5 inches based upon how tall a standerd HD sits. If you get underneath and look at the shock length its pretty telling, as they are very long just like a 6 inch lifted truck. Top of the cab is 82+ inches above the b pillar. It sits very big!

[@MZZHZZWZZ]

Jb has measured them, and they are 2 inches taller than the regular 24 AT4. When compared to your 15 however your math is pretty close. My 15 2500 HD with a 6.5" BDS and 37's is only 1.5 inches taller than a stock AT4X HD based on the listed numbers... pretty crazy lol.

[@gwendolynbrown9386]

I love the look of the truck!! Great video! Good fuel mileage 👍

[@JB_WhoWork]

Thanks!

[@carloseleivas8632]

Que belleza de Camioneta 😍 esa Sierra HD AT4X

[@JB_WhoWork]

Thanks!

[@austinmastvelten3545]

Coming from a 2016 1500 Denali with the MagnaRide in all four corners to this AT4X HD with DSSV, I feel as if the ride is very similar between the two. When you hit bumps in the road it feels firm, but the shocks absorb the hit so well you don't find yourself bouncing and lifting off the seat. I can agree with the sports car like ride because it's like the pickup is reacting to the road conditions instead of just being super soft and floating across like a trophy truck.

[@rsbreeze]

For suspension, I think you are describing firm, but responsive feel. Its the best lifted truck I've ridden in. I feel like the DSSV suspension on the 2500 HD ZR2 is about 15-40 % better depending upon terrain than a nice lifted truck with quality shocks like Fox or Bilstein or Elka. Like a Cognito lift. Haven't towed heavy yet, so jury is out on that one. It isn't even close to the ride quality on my 1500 ZR2 with similar DSSV shocks. That thing rides great and is a lot closer to "sports car" feel.

[@robertshones364]

Fun fact, the DSSV shocks are actually the exact same as the ones in the 1500 and the Colorado/Canyon ZR2/AT4X. All they did was change the valving, which is pretty crazy.

[@akendon7260]

I saw the AEV edition in silver, looks gorgeous and huge. I'm surprised you didn't get the AEV, considering how well you raved about the 1500 AEV.

[@Pinebaron2011]

Aha! I see you admit to the bouncy ride which I've been experiencing and I blamed on defective tires confirmed by GMC however denied all responsibility. As I also commented in another of your videos, I changed all 5 tires to Mickey Thompson Baja Boss due to them being three peak snow rated for my use in extreme snow. Tire pressures have been reduced to 42R and 45F and I have yet to take the truck on a longer test drive. My wife was a little disgusted with the first bouncy ride home hence I'm trying anything to have her ride with me. Perhaps I need to get rid of the suspension. I know I can't expect a 1/2 ton ride comfort from this 3/4 ton beast. No doubt about it, I love the truck, just getting used to the firm ride.

[@Rami-Day]

Loved they kept the column shifter but putting the trailer brake on the center console blows it to remove it to install my bencher seat... Those interior materials are a bit better than a ram limited.

[@JB_WhoWork]

I personally like the TB there but I understand the hate towards it 👍🏾

[@JasonVanPatten]

I just test-drove an AT4X yesterday and was giggling the whole way (with the sales guy). I'm in a '15 2500HD Denali right now and I do 10 year truck cycles, so I'm due December of '24 for a new one. The Denali Ultimate is the right truck for me but I can't get over the saddle brown interior. It smells fantastic, but I'm not a brown leather guy. There's only one proper color for an interior, and that's black. Period. I do like the interior on the AT4X specially with the same seats as the Ultimate. But she's a big girl, won't fit into my garage like the Denali can, and definitely rides a bit harsher than the Denali does, as can be expected. So I'm torn. The "base" Denali (if you can call it that) has the lesser-adjustable seats, and the seats are a BIG deal for me. Maybe the '25s will change up the seating options, or the Ultimates will have different color interiors. Anyway, enough of my sob story; I'm following your adventures and enjoying the info and opinions. Good stuff.

[@matthewanderson9912]

Nice test. I would say that’s about what my Duramax got for me driving to work typically. I wonder if maybe the tires could be the ride difference you’re experiencing?

[@x3dominator28]

My 21 Silverado RST on a six inch lift and 35” Mickey Thompson tires does 14 unloaded and 8-9 towing a trailer with the 5.3. Lifting trucks doesn’t help with economy for sure. Unfortunately I think I’m going to go back to an F250 with the 6.7 because towing is a bigger deal for me now. (Wasn’t when I bought the half ton). My local dealer has a 2500HD ZR2 in stock for 90k…. But I just can’t get behind that new infotainment system on the dash.

[@Pinebaron2011]

MPG: My AEV Edition is heavier with skid plates, steel front and rear fenders hence got around 16mpg on the long drive home and get 12-14 for local driving.

[@IQFSanAntonio]

Are those stock tires? They look bigger than stock.

[@TaylorSwiftLover-l7x]

Normally in cold condition engines are performing better compare when is heat outside, in fluid dynamics any fluid under heat they are increasing in volume so in heat condition you will have basically less fuel injected per stroke, this is why also you have an intercooler to cool down the compressed air after the turbo, by cool down the air you will reduce the air volume and you will be able to push more air inside each cylinder. Believe me that in cold condition your diesel truck is performing way better than in heat condition, more your diesel fuel and air are cold and more your volume is low

[@gregorydelarosa946]

Hey JB. I see you are running 2WD and I know the owner manual recommends… do you notice better fuel economy? I keep mine in AWD. Would you also recommend shifting to 2WD?

[@tomh9470]

The transfer case has a clutch that engages the front driveshaft when the rears spin faster than the front, while in AWD mode. When “disengaged”, the clutch still drags a bit and sends a bit of torque to the front wheels. This also puts some wear on that clutch. So, in normal driving on dry, paved roads, 2WD is your BEST option for efficiency & minimizing wear and tear. Plus, if you know how to use oversteer, 2WD is your ONLY option.

[@JB_WhoWork]

What tomh said, I sometimes will keep it in auto if there’s snow on the ground or going off road on a mild trail 👍🏾

[@ryanproffit2298]

My standard at4 hd rides like a lumber wagon unloaded. We test drove the at4x and the ride was incredibly better.

[@mattlee6218]

What are your thoughts on the Good year tires it comes with? how's the sound on the highway?

[@DavidBrown-jt7yi]

You need to stay away from those donuts and cakes.

[@JB_WhoWork]

😂😂😂 I can’t help myself!

[@JasonVanPatten]

The extra weight will affect the fuel economy... ;-)

[@Garage28_28]

bro what is the top speed on that cut off at 98 mph ?

[@jonathonsantamont8527]

I believe you are correct…. Governor kicks in…

[@thescoggfather]

The 55psi is likely part of the firm ride you are describing. What if you run it at 40-42?

[@JohnDoe-gm5ux]

Trucks not even broke in. Has under 500 miles. Should get 2mpg better once broke in.

[@JB_WhoWork]

And once it gets to 20k it will get slightly better again

[@airraptor]

Hope so, I bought mine 24 ZR2 in Idaho and drove it back to California and only averaged around 13-14. Once back in Cali I am seeing around 16 hwy. I drove it really easy from Idaho when I started with 3 miles on it. I have nearly 900 miles now and used about half a tank of DEF. I feel like it is regening often. maybe it is still in learning mode not sure. I heard you get a little chirp out of yours but i never hear that on mine. My 2017 would easily spin tires. Now with that out the truck is very tight like you mentioned and the power steering is very light. I love the truck. Mine is sterling metalic with all black wheels. People are stopping me to talk about it parking lots lol. Not used to that attention. I took down a bumpy dirt road varring from 40-60mph and truck felt good and planted. Next year plan to take to the sand dunes and see how well it does.

[@dougsmith747]

MPG will also increase as the ECM and TCM learn the drivers driving habbits. I have noticed that happening on my duramax. Every time I make a performance mod I will see slow MPG increase over 300-500 miles. Just my expierence.

[@vinnie8495]

GM did not build the trans in house. It was initially developed and engineered by Ford with help from GM to save costs. The 10 speed trans in the Super Duty is identical to the ones in gm/chevy with Allison badge. Ford has Different tuning vs GM

[@JB_WhoWork]

I think you’re referencing the half tons but GM definitely builds the 10L1000 in house

[@slidewide1999]

You’re completely incorrect.

[@vinnie8495]

@JB_WhoWork they both came out in 2020. They both were developed in ohio (gm at toledo and Ford at Sharonville plant). The Allison 10L1000 is a near mirror of the Ford 10R140, bellhousing/torque converters are slightly different, and a few other proprietary differences to apply to Allison's engineering and currently held patents

[@slidewide1999]

@@vinnie8495you’re incorrect, the half ton transmissions were codeveloped, the heavy duties were not.

[@bradh7472]

Check engine light is on?

[@JB_WhoWork]

No sir, I was in accessory mode

[@bradh7472]

@@JB_WhoWork After I sent that I was wondering that. Good deal.

[@robertdean6222]

I do not believe diesel motors are worth the extra $10,000 especially when you have to pay at least a dollar more per gallon for diesel. Your payoff probably only comes out 100,000 miles or more!

[@mini2nut67]

Fully agree. Unless you tow on a consistent basis the extra maintenance costs of a diesel engine are not worth it.

[@zackdattacker]

lol everyone who buys a diesel will drive it over 100k miles

[@chriscota1635]

@@zackdattackerI haven’t seen JB hit close to that before he gets a new truck lol just messing around

[@shanebowe7874]

Maintenance is definitely more but tbh it’s been so long sense I’ve seen diesel over 50 cents more expensive then gas

[@domsileo1145]

I didn’t buy one because I gave a shit about putting diesel in it…..just saying..

[@davidcmatson]

That was random.....just saying.