Quote:
Originally Posted by Phase
Rolling resistance isn’t as important on the highway. I’m just trying to figure out if downsizing an inch and also choosing a lighter rim will hurt or benefit highway driving.
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At 62mph, rolling resistance is still in the ballpark of 25% of the total energy needed to move a vehicle. It drops to ~20% at 75mph.
Sure, that's smaller than aero, but it's still significant. Also, the EPA "highway" test averages less than 50mph, and includes a fair amount of accelerating and decelerating, which may account for part of what you see in the highway rating.
