2015 2500 duramax fuel mileage

We have a 2012 D/A crew-cab short bed and pull a Jayco HT 26.5 RLS with a 19' Crestliner behind the FW. When pulling this combo from Lander, Wyoming to Jackson Lake in Grand Teton National Park and back, we get between 11.5 and 12 mpg. One trip we got 13.6 but only that one time. Traveling at 70 unloaded we get between 18 and 19 mpg. Depending on the hills and mountains you travel through, I would think that is about what you should get, if not a bit better if you are closer to sea level, we live and drive at 5,000' altitude and above.

I get 10-11 pulling. Although I usually am at 70 on the interstate as well. If I slow down I'm sure I'll see better.
Empty the best I've seen is 23.5 on the meter.
Only have 13.5k on it so maybe it not totally broke in yet.
The older one is the first full year with regeneration and uses diesel to do it so the mileage sucks. Unfortunately that's the one that get daily use too.
Overall I love the Duramax!

It's not just about how you drive. Cruise control is cruise control regardless of who's driving. Mileage From one truck to another (same brand/model) can vary greatly. I pretty much got a **** one when it comes to mileage and am in the 8.5-9mph range towing my 12k lb 5er on flat ground with cruise set in the 63-66 mph range. Have never seen double digits towing yet I know many others have.

My 2014 2500HD 4X4 will do 16 to 19 not towing, any where from a low of 9 pulling hills into the wind to 13 on a flat stretch and no head winds. Jayco 321RLTS. Third Duramax, no complaints or issues with any.

We are consistently getting 12.5 mpg towing our 33' fiver with our 2015 3500 4x4 Short box with the Duramax. This has been pretty consistent over 34,000 miles. We are pleased...

It will depend on 2x4 or 4x4. The 4x4 will get worse mileage.

Mark

I have a 2015 dually. My mileage is the same as everybody else. Worse up here in the tundra with our Winter blend of fuel...

Tar wrote:
I am thinking about upgrading to a 2015 2500hd duramax to pull my 34' 9600# fifth wheel from my current 2500 gas truck and wondering what fuel mileage to expect pulling in mostly flat land travel with some small hills?

Most diesels in the 250/2500, 350/3500 class seem to get between 9 and 12 mpg. It really all depends on how you drive. I went from a solid 10 to about 11.5 avg by slowing down to 60 mph from 65. Doesn't mean that I don't drive 65 when I need to, but I much prefer 60. This is with the '02 D'max in my sig. You like to drive 70-75, count on 8-9, or less. Headwinds can cost you 3-4 mpg and vice versa.

Lyle

MY 2015 srw 3500 averaged 11.5 US pulling a 15k fiver 60-65 mph,1800 mile trip to Palm Springs.

Thank you for the replies I like the thought of going to a 3500, might want a bigger camper down the raod