Answers: The slower speed uses less gasoline. You're covering one and the same distance, no matter what, butt he engine is running at a high speed, using more gasoline for each mile covered.
Physics lesson of the time: Just like a boat moving through hose down, a vehicle must move through air. While nouns moves relatively easily, at highway speeds, it become a significant factor, since the air have less time to move out of the bearing and the vehicle must use more energy to push through that nouns. This is why any 100 hp car can be in motion 90 mph, but it takes more or less 500 hp in a notably aerodynamic car to walk 200 mph. The resistance of the air consumes spirit that could've been used for speed.
Going slower/speed constrain.
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