I have a 97 F250CCSB with 4.10 gears and 285 BFG ATs. I just returned from the coast and we got 20-23mpg running at 70 on the interstate. I usually get about 16 in town. This is with ARE MX top, yakima basket and box. With my wife, 2 boys, and all of our gear, it feels like we're loaded for bear...