when I got my truck the dealer had put nitrogen in the tires and pin stripping...I didnt want that crap so i refused to pay for it. I told the salesman you wanna put it in all the jeeps you have in the lot? fine but you are eating it Im not paying for it. Any way, my low tire light came on. Can I add regular air to that? or do I have to let it all out and then add air. I refuse to pay the price for nitrogen.