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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In addition to wind resistance, most engines and transmissions are more efficient at 50 mph than 70. Picture a bicycle: at a high speed and a high gear, you can cruise along with slow, leisurely pedaling. If you wanted to go 30% faster, you could – but you’d have to pedal like crazy, which would tire you out faster.
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