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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I think air resistance is the biggest factor. Air resistance goes with the square of the velocity. Accordingly, if you double your speed, air resistance increases by a factor of 4. Triple it and it goes up by a factor of 9.
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