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Originally Posted by blue2000s
Strictly speaking, if the loads and engine speeds are the same and there are no other differences but vehicle speed, there would theoretically be no difference in the wear on the engine given a set amount of time. The total miles on the car would be different, but that wouldn't matter to the engine.
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engine load is what matters. if you're at 5K in 2nd and accelerating full throttle, this is different than cruising at 5K in second (stable speed). that having been said, the load on the motor is higher at 130mph because power required to overcome the air resistance at this speed is significant, increasing engine load.