A supercharger forces more air into a car engine's cylinders, allowing them to generate more power. Find out how aspirated air is compressed through a supercharger with help from a certified master mechanic in this free video on cars and fuel economy.
Good afternoon. My name is Tom Brintzenhofe, certified master mechanic, from Redding, Pennsylvania, and today, I'm here to answer the question of, Why does a supercharger get better gas mileage? Well, I can sum it up real quick, in a few sentences here. Any time you have any kind of mechanical engine, aero induction plays a huge role in the power, that gets generated within this engine. Anytime you can force more air into the cylinders as they're firing, the more power you can generate out of them. Now, a supercharger does exactly that. It takes the actual force, it takes air, normally aspirated on a regular engine, and compresses it and pushes it down to a cylinder, and it puts a lot more volume of air, than any standard fuel injected engine, carburated engine, could ever put in by itself, and that there will generate roughly about 20 or 30% more horsepower, even off idle cruising speeds, and that there, like I said, with the added horsepower, and with less amount of fuel, will generate you your better gas mileage, and that's basically why a supercharger gets better gas mileage.