Gas Mileage

[MostWanted]

What are you guys getting as far as gas mileage goes in the L86 6.2Ls? I'm pleasantly surprised with what I have been getting.

 

[MVR 155]

My best 50 mile average has been 25.2mpg's. this was done on 55mph two lane road. Real world highway mileage is 17-18 and that is doing 80mph.

2015 standard wheelbase Denali with the 8 speed.

 

[Ekim]

Picked up new 17 in mid December. Over 8000 miles and average 18.9 for those 8000 driving in the mountains!

 

[Yukon John]

These GM SUVs get fantastic mileage....especially considering how comfortable they are and how well they perform. I think GM knocked it out of the park with the Direct Injection technology !!

 

[AZCreeker]

On a recent 400 miles road-trip, had no problem getting 24mpg at 65mph and that was with going up north and encountering tons of elevation changes. I did not use any hypermiling technique, just set the cruise and forgot about it until the end of the weekend.
I am also quite impressed, oh and that's withe the stock front deflector removed and the shorter police deflector in place.

 

[aggiediver]

Best I've gotten on the highway is 23.5, but consistently 20 on the highway. City is much less depending on a lot of factors, but consistently much much better than my '09.

 

[zmann96]

Is everyone using the computer AVG.MPG ? I've noticed when I take my mileage at fillup and figure the MPG myself it's been as much as 5mpg less than the computer.

 

[MVR 155]

Is everyone using the computer AVG.MPG ? I've noticed when I take my mileage at fillup and figure the MPG myself it's been as much as 5mpg less than the computer.

I calculate miles driven by gallons at fill up. I typically see less than a 1mpg delta between the trip computer and real math (trip computer always on the optimistic side). I do top off every time I fill up so that could be a contributing factor??

 

[Tozan]

I have been getting 12.6 mpg since I lifted it and installed 35 in tires... Before that I averaged 18 to 19 mpg 90/10 highway/city... I will be installing new gear sets next week going from 3.43 to 4.88 I hope to se some of my mileage come back.