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I agree, but there is only so much gain to be expected from reduced friction. The guy I referred to spoke of a near 50% increase. I don't thing you could gain 50% regardless of what you did regarding engine lubricant.

Increasing tire size would be akin to having a higher gear to shift into. The drawback is that it takes more time to get to that "sweet" spot where it pays off. And you'll spend a lot more time in the lower gears so it practically cancels itself.

I'd love to have a Toyota 4WD for a work truck for the days when all I need is what's in the truck, but I can't justify another truck just for the fuel savings. My 1995 Chevy 4WD 3/4 ton gets around 12 - 14 MPG so I guess I'll drive it til the wheels fall off.

Oh there are a lot of variables when it comes to gas mileage. Going up a tire size will theoretically give you better mileage, but it will decrease your power. Like driving a straight shift and getting it into high gear 10 MPH before the engine's ready for it. It'll put excess load on the...

:lol: Reminds me of a guy who once tried to "sell" me a can of oil additive. His story was that he got a case of it from a guy who was wanting him to become a dealer under him. He said the stuff would increase your horsepower AND boost your mileage. Why his Chevy 1500 went from around 12-14 MPG...