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Nick666 brings up a good point that I'd like to riff on:
Ib like to think of everything in terms of energy, and use comparisons that easily demonstrate that idea.
Acceleration: faster acceleration takes more energy, and therefore more gas (engineering of your car notwithstanding). Think of riding a bicycle and accelerating to 20 mph from a dead stop.
It can be done easily if done slowly, but your legs would be on fire if you went flat-out to get to 20 mph. Same goes for the car.
This also applies for coasting, braking, conserving momentum, etc.
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