Waste of money, We use nitrogen at work for the aircraft tires and jet bridge tires. If you check your air pressure on a regular basis there is no reason to use N2. The aircraft use it because of the constant air pressure changes, and on the jet bridges we use it because we do not check the air pressure daily, and these tires and tubes always seem to drop pressure. In your vehicle there is no added benifit, dont waste you 20 bucks to have it added. Most shops will check you pressure and top you off for free, or get an air compressor for your garage!!!!!!!!!!!!