I'd say if you're worried about gas mileage go buy a honda. Running 35's, you'll never get the gas mileage of a stock truck/4runner(which in my opinion isn't all that great to begin with). My set up has the 3.4L, auto, 5.29's, 37's, and HEAVY H1 beadlocks. I drive a lot (<--that's an understatement) on the interstates and in town(any givin Monday morning or Friday afternoon you can find me passing cars in the middle of ATL), i am extremely happy with the gearing i have. I average 14-15mpg, and i don;t drive anywhere slow. If i was planning on running 35's i'd still go with 5.29's.