Why does driving over 55 mph decrease fuel efficiency?

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I think I understand that driving faster increases drag because there’s more air pushing against your vehicle, but why is the drag for that distance greater at higher speeds? If a car is driving slower but across the same distance, wouldn’t the total impulse created by the drag be the same as going faster because it’s delivered over a greater time, even though it’s a smaller force at any given moment?

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Anonymous 0 Comments

Impulse is not energy. While the impulse actually isn’t linear, even if it was, the impulse doesn’t matter. The energy (force times distance) is higher because the force is higher.

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