What kind of mileage should I expect from a 96 SR on 33x10.5s? I just checked the mileage from my first tank with them on and I only got 12.5 mpg and that seems pretty low to me. I have no check engine lights and I accounted for the odometer difference due to the larger tires. It also only took approx. 18.5 gallons to fill up from the gas light. Is that about right?