Originally Posted by Strongjeff
wow that's bad. id a figured you would gain a couple on the highway since the larger tire would in theory make the gearing taller, youd be turning less rpms
It doesn't actually work that way. While rotational speeds of the outer portion of the tire change, its not going to really have an impact on MPG the way you think.
In fact, larger tires have far more rolling resistance which make them very poor on gas mileage. That's why
economy cars tend to have such small and skinny tires.
Plus, when you lift a vehicle, the air resistance magnifies. A couple of inches can mean a loss of several miles per gallon.