2015 2500 duramax fuel mileage
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...
Forum Discussion
whiterose wrote:
Now have a 2015 Denali with Duramax and a 15,000# Montana on order. Hoping for 12 mpg, but reading some of the messages unlikely to achieve this. Unloaded and travelling at 65 (220 mile trip) I achieved 21 mpg and at 70 I achieved 20 mpg (450 mile trip). Had a surprise last week when I returned 13 mpg at a steady 55 mph over 40 miles and then on the return trip 23 mpg. Discovered this was down to the raw fuel being dumped into the exhaust as part of the emission equipment.
So come April I will have experience with the big Montana. I will search for the 'Truck Haul' speed that allows me to use all of the transmission ratios.
Yep you will have the occasional regen and you will also notice going through DEF a bit quicker when towing for extended times. All in all not real major issues considering the ease of which it will motor on down the road. So far your mpg sounds right in line and I'd agree you probably won't quite make a 12mpg average. I'd lean more towards 10 with that kind of weight. You will still have far greater range than with the old setup and probably be ready to get out and stretch your legs by the time you need fuel. :)
