Its a 1992 Xtra Cab SR5 Toyota 4X4 pickup (Eat your heart out, nickthebassist ) Its riding stock right now, on 31x10 tires with 15" wheels. Basically, I want a 3-4" lift, and 34x10 tires. Why? it looks bitchin'... and i wanna do the Rubicon. The only problem is that I do not want to kill my gas mileage. Re-gearing? Changing differential ratios? what can i do?