Quote:
Originally Posted by Ecky
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.
 |
What I’ve noticed a lot with my heavier snow tires and getting worse mpg besides rolling resistance is when accelerating. It’s very rare that I’m on a perfectly flat road with cruise control and no traffic. There’s always some type of accelerating or coasting going on with highway driving, whether it being going over a small hill or someone pulls in front of you and then speeds back up or going around someone to pass and so on. The throttle is always changing