Sorry, I meant empty cars. Even though that would create a job market where you pay people to sit in a car to avoid taxes (hire teenagers for that?), so maybe just tax cars by miles driven instead of on a fixed basis.

The only reason we don't tax by usage is because we don't have the data. If cars have that data, it would be by far the superior system. Why tax someone driving 100mi the same as someone driving 100k miles?