The properties of air that you care about are basically immutable, so why not pre-compute a bunch of compressed air instead of compressing it on the fly, and th

The properties of air that you care about are basically immutable, so why not pre-compute a bunch of compressed air instead of compressing it on the fly, and then having to carry the equipment to do that. There is an energy cost to supercharging. While you get an overall horsepower boost, it's less than what it would be if the compression cost nothing.