In school we learned ” what you save in energy, you have to increase the way.” By that rule you should use the exact same amount of energy (fuel) for the same distance no matter what speed. I’ve asked a few people, but no-one could give me a good answer.
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The resistance of a car moving at low speeds is dominated by rolling resistance.
At higher speeds, you still have the rolling resistance, but the resistance is dominated by wind resistance, which increases with the square of the speed. Thus, the wind resistance at 50m/s is not 10 times greater than 5m/s, but rather 100 times greater.
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