Thread kind of old but I'll throw this out anyway...2008 chev 1500 4wd Z71, 4 speed auto, 3.73 gears, stock tires: gets 21 mpg on pure gas (no corn in the tank; reduces mpg by 10%) according to the on-board trip computer. Hook an empty lawn mower trailer to it and gets 16, XJ on 2200# steel trl gets 12ish, 30' travel trl at 55-60 mph in third gear to beach gets 10. Oh yeah, I tend to drive like I'm the one buying the gas too.