Personal Best MPG?

WyoRock · September 6, 2016

I traded in my 2015 Sierra 1500 with 5.3L V8 and max towing package in primo condition for a 2016 1-ton Denali with Duramax 6.6L diesel (don't ask why). My Sierra typically got 18 mpg on the highway, and could touch on 20 if driving downhill from Cheyenne, WY to Denver.

Yesterday, I drove quite a ways in the new Denali to get to 500 miles on the odometer, since I need to tow a trailer tomorrow and thought I'd make sure the drivetrain was broken in. I know there are those who don't agree with the need of a break-in period, but that is not the focus of this post.

Anyway, I averaged 25.7 mpg! Even with babying the throttle, that seems like some kind of record-high mpg. (Attached is a photo as proof). I am amazed. Is this typical? Is my new 1-ton actually an eco-green Prius-ized truck?

Please let me know if you've beaten that!

Thanks

North16HighCountryDuramax · September 6, 2016

I am totally impressed with my 2016 2500HD High Country...

My best is 9.2l/100km (in Canada) which c]should be just under 26mpg also

SouthpawHD · September 6, 2016

I actually got around 35MPG on a 25 mile stretch.... We were slowly plodding along in Yellowstone and the mileage was fantastic!!!

Skeld · September 6, 2016

6.0 2500 crew cab, my best 25 miles is 18.2 MPG so far.

Willshire · September 6, 2016

27mpg once

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Jlash · September 7, 2016

13.4 drove from chicago to stl this weekend with my dirt bike in the back and hauling a small 4x8 utility trailer, had the cruise set at 75 on interstate 55 (no hills).

pogrelis97 · September 7, 2016

Only have 140miles on my 16 Duramax but my average is 21.6mpg.

vertigo · September 7, 2016

New 1 ton SRW Denali here as well.

25.7 is awesome. My personal best is 23.1 with an average of 20.4.

What I have found helps me out is if I lightly accelerate down the small hill's ( no mountains in S. Ms. ) and coast up as much as possible.

The improved economy in the new truck is a godsend compared to the economy I used to get in my 2011 F350 DRW. Which never went over 17.6 mpg no matter how much I tried to feather the skinny pedal.

fjtort2 · September 8, 2016

'15 6.0

25mile trip- 17.4mpg

50mile- 15.4mpg

400mile-12.9mpg

All empty or with a mountain bike in the bed

Cowpie · September 9, 2016

'15 6.0, my lifetime average is hovering around 13-14 mpg for all miles... gravel roads daily, highway, in town, off road, hauling, etc. For road trips (300 miles or more - unloaded) it has consistently gotten 17-18 mpg each time. Hand calculated several times and DIC is only off by a tenth.

avalonandl · September 9, 2016

My best is 23.7 w a Duramax

crankman · September 9, 2016

15.4 my average in 6.0. I think you were wise to follow break in on your Duramax good for you

Gecko50 · September 11, 2016

Well driving at 74 miles a hour and its had less than 1,000 miles. a 2016 Diesel Denali 4 x 4 Dually,it hit just over 21 MPG on that run. I continue to get surprised on the mileage compared to my '14 I traded for this one.

Driving got busy so I couldn't take more pic's.

Chuck

PAE

waynev01 · September 11, 2016

2015 1500 Silverado 5.3L

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Mark Mortenson · September 13, 2016

15 6.0 I've seen anywhere from 5 to 17.8 mpg for a tank. I have some sort of trailer attached 75% of the time. The mileage seems to be pretty predictable depending speed, distance and load. 15k miles overall lifetime average is 10 mpg.