Originally Posted by
dedwards0323
So are you stating that changing the tire size actually improves or reduces MPG? Or are you just referencing that the resulting calculated MPG is better or worse but not really the actual MPG? Can't see how changing the tire size has a definitive impact on actual MPG. Curious?
Larger tire is heavier and adds rotational weight, like how lighter rims, rotors, driveshaft looses rotational weight can increase mpg and increase power to the wheels.