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I'm guessing that the answer they're looking for here is that as the speed increases the wind resistance increases more. This means that if you want to go 10 % faster maybe your fuel consumption will increase with 15%. Staying below the speed where wind resistance really begins to hurt lets you get away with using less fuel, which is better for the environment.

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15y ago
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Q: Why is driving at 30 mph better than driving at 40 mph?
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