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Old 10-25-2005, 05:04 PM   #3
chismtrail_er
Senior Member
 
Join Date: Sep 2005
Location: Wimberley, TX
Posts: 124
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
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