How is it much more fuel efficient to travel at say 50 mph for longer than 70 mph for a shorter period of time. Like if I was going a set distance, if I drive slower I’m using the car longer so why isn’t it the same fuel being used.
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It is mostly due to wind resistance. If wind resistance were linear, then going faster for a shorter period would be just as efficient as going slower for longer. But wind resistance actually increases with at least the square of speed, so that going faster uses more energy over the same distance than going slower.
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