The answer lies in drag: every time you double the speed you travel in a car, the energy you use quadruples. That’s because you’re fighting against more air resistance. This means your gas mileage is worse when you speed. You can also improve your gas mileage by driving at a constant speed and slowly increasing or decreasing your speed when you have to stop or start.
Reference: https://learn.eartheasy.com/guides/fuel-efficient-driving/
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