Best miles per gallon?

[Ozer]

On the sliding bar it says i will get 99mpg if i just keep coasting down hill like that for about 400 miles  

 

My average is around 16-17  Bigger tires, level, v8 only, not to light throttle

[dkmoneypit]

2018, LTZ, 6.2l, max tow, stock tires and wheels = 23.4 mpg for the first 600 miles of its life driving home from the dealer.

[Birdwatcher62]

2 hours ago, djw88 said:

only looking at the last 25 or 50 miles is a poor example.

I tend to agree. Just haven't changed the factory settings yet. Mine would be less.. I do a lot of city driving.

[Crstfr]

3 hours ago, djw88 said:

only looking at the last 25 or 50 miles is a poor example.

agree!... i only do it for the tank. so 400... i get about 16-17... 5.3 8speed... air dam removed, leveled, mit tube, k&n drop in, and super 10 dumped 

 

but my tool box is full, come a long, 1 ton jack, chains, tools..etc...

[Squiderado]

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[15 Z71]

20 minutes ago, Squiderado said:

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I don't know how some of you guys get 26 or 27 mpg. Best I ever got was 23 or so. That's super easy on throttle.

[Squiderado]

I don't know how some of you guys get 26 or 27 mpg. Best I ever got was 23 or so. That's super easy on throttle.

I think I was essentially coasting through Cleveland lol, I can get 23 pretty easily though. I don’t know how effective it is but I do have a k&n air filter and a cat back exhaust, and from what I hear that can boost your mpg’s a little bit. I also have nothing in my bed.


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[Grumpy Bear]

Just a thought guys. My trucks DIC reads a good 8/9% happy over averaged hand calculation. Just say'n. 

[Donstar]

On 5/7/2018 at 1:57 AM, Blk17Machinep said:

12.4 mpg. Truck is a pos 

If you're basing this on the figures you see on this thread, relax.  Many factors influence mpg and it's either the type of driving, how you drive or the equipment on your vehicle that gives you poorer mpg.  I measure by liters per 100 kilometers and quite often my "average" reads double to my "best"!  When pulling my travel trailer or delivering meals to shut-ins, my truck guzzles  fuel.  When I'm cruising on flat open highways, my truck is sipping gas like the best of 'em!

[Loco-diablo]

My best for 50 miles is 24.5. Overall mileage for the life of the truck is about 18.5 as shown on the 'B' trip odometer that I have never reset since owning the truck. My trip 'B' shows the same number of miles as the odometer. 

[Dnt]

Stock 17 crew cab denali ultimate 6.2 has averaged about 20.7 over 17,000 miles. Getting better now on summer fuel..... 

[L86 All Terrain]

I had the DIC reading 9.5L/100km (24mpg) during my first 250 miles with my 6.2L. I thought that was a little exaggerated as I never got that again, "test drive mode" I guess.. Average now is 13.5L/100km (17.4mpg) but hand calculated to about 16mpg. My 5.3L uses 15.5L/100km (15.7mpg) over it's life, but up to 17mpg on long drives. My 6.2L has 33x12.5's R20 E load and I still seem to do better than the 5.3L on that is on a 265/70R17 D load. Nowhere near the EPA rating of course, but I can't complain. The 6.2L is over 1.5 times more powerful than my old 90's Vortec 350, and burns less gas. I think my issue with the 5.3L is my foot always wants it to go like the 6.2L so you are always in it a little harder, that and 6L80E vs. 8L90E.

[busydaddy]

Computer says the best was 23.8 which means diddly squat to me. My 2018 5.3 max tow is at 16.8mpg over 4500 miles lifetime which seems much closer to reality.


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[tnchevy]

The dic readout is usually about 1mpg off (to the high side).  The best 25, 50, 400 does not mean squat, especially the 25 and 50 because you could have coasted down a large mountain or something.  Calculating by hand over many thousands of miles is the only true way of knowing.  I've got 24k miles and hand calc every tank.  My life time hand calc is 19.11 and my life time computer (never reset trip B) is 19.8 mpg.  My mpg's have actually started to get worse with mileage while my 2002 got better with mileage.  My 2002 also had a lifetime mpg of around 19 mpg so not much as changed in the mpg's department for my type of driving.

[MaverickZ71]

17 hours ago, Grumpy Bear said:

Just a thought guys. My trucks DIC reads a good 8/9% happy over averaged hand calculation. Just say'n. 

THIS.  Same or worse for my totally stock truck.  Everytime I gas up, the station fuel pump says ~13 gallons and the DIC says ~11 gallons, and so on.  Asked the GM service dept to fix/recalibrate it, and the manager laughed and said don't trust any of 'em, always hand calculate if you wanna know the truth, and there's nothing they can do to fix them, as the General likes for everyone to think they're getting better MPG than they maybe really are.  And turning off AFM had no discernible effect on mpg.  Personally, I think GM had one software calibration for the DIC with the 6L80E, set to the stock 3.08 gears, so for everyone with 3.42 or 3.73 gearing, it is just off.