I usually get around 10-12 mpg towing, trailer weighs 16350. The Duramax is fabulous. No trailer, I get 16-17 depending on terrain.
The biggest variable in mpg is whether "Tow/Haul" is on or off....I lose mileage with it on, but the Allison tranny does all the shifting for me, and really helps the "braking". Worth evry penny, but wish I was getting a new 2006 w/6spd.
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Jay & GayLynn
05 Chevy 3500 DRW 4x4 Diesel/Allison
Prodigy
05 36TK3 #1557
DirecWay/DirecTV
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