I was thinking about upgrading to a 2500hd with the Duramax and the allison transmission. I was wondering what kind of gas mileage yu all are getting. With, and maybe without the the chip or programming mods.



Thanks all,

Bill

with the predator sport tune thingy on the second setting it gets better throttle response, noticeable power gains and ~17 mpg driving pretty rough.

Not bad for a 6000 lb. truck I guess.