ah yes, i think that they called them tweels in four wheeler or four wheel and off road.

so with two otherwise identical tires, one rated at 50 psi and one rated at 80psi, the one that takes 80 will get better mileage?

and does that also mean that 235/85's would do better than my 33/12.50's even though they are a big shorter (taller tires make the engine turn slower at any given speed)

also i have heard that over 40,45 mph air resistance is a bigger factor than rollng resistance.