Yes it is true the air compressor that powers a nail gun can fill tires,:xyxthumbs: and with the correct piece on the end of the 50' or what ever length hose, wil also blow air for what ever reason you deem necessary!!! cowl area, window, key locks, gas tank openings, around liscense plates, fender openings, door seams, tires, lug nuts, outside mirrors, engine bays, running boards, and many more uses I have not listed!!!!