Most cars have their most fuel efficient speed at around 80-100 km/h, but most main roads are 100-130 km/h in terms of maximum speed. Shouldn’t we change cars?
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Air resistance is approximately proportional to the square of the speed. That means the faster you go, air resistance increases very quickly. The amount of work required to push the air out of the way at high speeds means the most efficient speed can never be very fast.
So if its less work to go slow, why isn’t it most fuel efficient to drive very slow? The motor wastes energy just making itself run and powering the various other systems of the car. So if you drive slow, you spend more time out on the road.
So you want to find the sweet spot where you aren’t driving for too long, or driving too fast.
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