Gm 6.0 litre v v t v8 tow vehicle engine

[FrankM]

Never had a newer gas Chevy but have an '07 2500HD crew cab long box LMM duramax and would never tow with anything but diesel again. I can get 12mpg with the family and the 24'. Another thing to think about of diesel over gas is longevity, the diesel will always outlast a gas when apples to apples conditions.

[cad]

Originally Posted by Jeremy1374

Just out of curiosity what do you figure your avg MPG are? Is this a 4WD & what cab/box configuration is this?

It was a loaded 4wd LTZ Crew Cab. I think the average on the DIC was just over 10 when I traded at ~4600 miles. With a 34 gallon tank, towing 90 miles round trip to the local track and back, and 50/50 in town/hwy unloaded the rest of the week, it would only muster about 270 miles per tank (refill was about 28-30 gallons...somewhere in that range) on 89 octane gas.
I hooked up an inexpensive OBD2 dongle and monitored timing while towing once. On the flat with little wind, the VVT technology would alter the timing constantly. As low as 9 degrees and never more than 24 while towing.

Here is just an estimated mileage/cost calculator I used to convince my wife to let me dump a brand new truck for a Duramax. Note the cost per year in fuel...