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Originally Posted by FSETH
If all else is equal (weight and so on) and one wheel had a larger overall diameter than another wheel, it only seems right to me that the larger wheel would get better gas mileage. Your engine would have to turn fewer RPM's to get the same vehiicle speed with the larger wheel, right?
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The key to your statement is "if all else is equal". Unfortunately, it never is. In reality, larger wheels are usually heavier, so your gas mileage will decrease slightly. Also, if your new wheels and tires are wider, there will be more wind resistance, which will also lower gas mileage. But the difference we are talking here is rather minimal. Maybe 10% difference at most, unless you are putting monster tire sized wheels on your truck.