I'd like for my truck to still be around 20mpg hwy when all done,
KyleW707, based on my calculations I'll be running 2200-2300 @ 75mph plus as u said my truck is lighter and I chose the tires, because they are the lightest weight tire of the four that I liked, I plan to run 285/70R17 Goodyear Wrangler DuraTrac (54lbs) so I'd agree 2-3mpg better sounds about right
I plan on this being a performance truck with an aggressive offroad look

Beside the toolbox in the bed, the only excess weight I plan to add is a winch and hidden winch mount