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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You need a greater amount of energy to reach and maintain a higher speed, because you have to overcome more air resistance and it’s not linear. Let’s say you need X amount of energy to keep a car at 100 mph. If you increase the speed to 200 mph, the amount will increase to something above 2X, and so on.
It’s not only about air resistance, the reason nothing with mass can reach lightspeed is because it would require infinite energy, but this is ELI5
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