5.2 gallons of air will last a few seconds. Your compressor motor is going to be running virtually the entire time you are operating the tornador. I ran mine tonight on a 26 gallon, 2HP Husky compressor and found myself waiting for the compressor to catch up every few minutes. I had a slight air leak at the regulator but I was burning through air like crazy cleaning carpets and seats. It would probably work fine for doors and dash though.