[TwoFiftyShifter]

What size tire? I can get 15 in town and 20 highway in my dad's 07 4x4 1500 extended cab, 5.3l. alot of it is how you drive. However, if you have say 265/75/16's, going to 245/75s will give you 1 mpg almost guaranteed, wont look as good, but that has been my experience.