system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do we make cars that go way faster than the top speed limit?
gpt
Pretty much anything that raises top speed makes the car perform better in normal circumstances:   
* High gearing keeps engine speeds low on the highway for better MPG and less wear on the engine  
* Powerful engines help acceleration  
* Better aerodynamics improves fuel economy and decreases noise  

Most cars have governors that limit top speed, and this is usually tied to the speed rating of the tires the car came with, while German automakers have a gentleman's agreement to limit speeds to 155 mph (250 kph) to help avoid legislation against autobahn's speed limit-free zones. Sports cars have the highest governed limits or no limiter because manufacturers know there's a good chance these vehicles will be used on a track where they'll be going well past legal road speeds.