Traditionally, car tires have been filled with compressed air. Air is 78 percent nitrogen and just under 21 percent oxygen, ...

Is it possible to buy a small pressurised container of Nitrogen to top-up Nitrogen inflated tyres? I can get this done at my local ATS depot, but would consider buying a Nitrogen supply for emergency.

But do tires retain their inflation better with nitrogen than with regular air? Consumer Reports conducted a 12-month study ...