Interesting quote from pg. 6:
Quote:
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The average percent fuel economy improvement of hot tires over tires at ambient temperature is approximately 5%. It was found that this improvemnt does not change with respect to tire type, size, or manufacturer. This 5% improvement is fuel economy on the dynamometer corresponds roughly to a 50% decrease in tire rolling resistance on the road.
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I've noticed in the mornings it seems to matter not only what the current temperature is, but also what the overnight lows were. I seem to do better when it was warm overnight. I wonder if that's because the road temperature heats up the tires more quickly.
I wonder how much of it is due to in increase in tire pressure. I also wonder how much of the total rolling resistance is due to the tires, vs. drivetrain friction.