In school we learned ” what you save in energy, you have to increase the way.” By that rule you should use the exact same amount of energy (fuel) for the same distance no matter what speed. I’ve asked a few people, but no-one could give me a good answer.
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1. Wind resistance. Faster speed = more wind resistance. Stick your hand outside a car window while driving and feel the difference between slow and fast speeds. That is whats “pushing” against the car while driving.
2. Modern cars have transmissions (The thing that converts engine power to wheel power), and are optimized for specific speeds. Low RPM but high gear is more efficient than high RPM and low gear.
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