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Keep in mind that if you use your engine to get up to speed, and then turn off your engine and coast - you ARE still powering your car with your engine!
Your forward movement energy came from somewhere - the gasoline you already burned back a ways.
If the energy didn't come from the gasoline, what magical force is pushing you forwards?
Now if you did all your MPG calculations while pointing downhill - THAT would be cheating. The magical force there would be gravity.
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