Quote:
Originally Posted by Big Dave
I've talked to literally hundreds of truck guys. Bigger diameter tires actually reduce MPG.
The reason is increased rotational moment of inertia. RMOI goes up with the square of the radius. Big tires are OK if you go long distances at a constant speed, never slowing down or speeding up.
I don't drive that way.
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Even w/ large tires RMOI is quite small for most vehicles, something like 10Wh/mile assuming a 0-60-0 every mile. Odds are it's an increase Crr/CdA associated w/ the larger tires.