I saw a slight drop in fuel economy when I went to 285/75-16's from the stock size, I like taller tires though. I'm thinking of using a 255/85-16, but the only tires I know that are available are Goodyear MTR's and BFG Mud terrains, which I don't want to use because the aggressive tread cuts down on fuel mileage some. Dunlop makes a tire, I think its called the RVXT, that's the only other tire I can find in that size. Anyone use it? Anyone using 17's or 18's? I'd like to use a tire that's approximately 33" tall but narrower than what a 285/75-16 is. Thanks