I basically leveled out my front(which took 3" on my truck), and although my friggen SCT programmer can't accurately correct my speedo for the tires, I'm getting progressively worse mileage than I was stock(I'm in the low 12's). I'm running 33.4" tall tires, but where I think I'm doing the damage is with their 12.3" width and 10-ply(E) weight-SEVENTY TWO FARGING POUNDS EACH. Next time 'round I'm looking for C or D rated tires, and 11-11.5" wide MAX.
Problem I've found is with an 18" wheel(the size I like), you have A LOT of E-rated tires, and very few C or D's. Especially in anything taller than a 32.
As far as the professional bull-****ter claiming '20mpg easy' with 35's, you shoulda asked for a minute to put on your waders before he told you that.
Last edited by yokev; 12-22-2012 at 04:35 AM.