That's because you usually have a speed limit. If you have a car with say about 100 hp your top speed will be about 200 km/h and that is a speed you can drive a

That's because you usually have a speed limit. If you have a car with say about 100 hp your top speed will be about 200 km/h and that is a speed you can drive at for extended period on an Autobahn in low traffic. A more powerful car will of course make it harder to keep the pedal at the metal.