Quote:
Originally Posted by nascarnation
In big highway trucks, the rolling resistance decreases as the tread wears down.
On cars also it might well be that a new tire of a given make might be worse than a worn out one.
Hard to imagine 2.5 mpg difference though, that's a big change.......
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That works for all tires. The less material there is to flex, the lower the RR. It's just more noticeable in big rigs as rolling resistance at highway speed is still in the 40% of total load, much more than cars.