A little stats on my truck before I get to the mileage, since there are many factors to the mpg equation besides brand and type.
02' Chevy Silverado, 6.6 Duramax w/ Allison trans., 4" full exhaust, a mild tune, 33.5" Tires and a 3" lift kit.
On a recent 900 mile round trip to Minnesota I got 19 mpg on the free way. That was going 72 mph on cruise control the majority of the way. Keep in mind it is rather hilly for half the trip and gusty winds for the trip there with snow covered roads 1/4 the way home.
If going actual high way speed 55 Mph, my best mpg was 24.5, but this was really babying the throttle, brakes and on a high sulfur summer blend. But on avg. I get 21-22 mpg. If I do alot of city driving, my mpg go down 15-16 mpg. If I tow/haul around 10k I get 18-19 on the highway. When I had my 35" Mickey Thompson Baja Claws on, I was getting 2 mpg less and almost 4 mpg less when hauling.
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