Nitrogen in car tires and truck tires alike provide noted improvements in vehicle handling, fuel efficiency and economy. And with today's gas prices that's a good thing! Increased tire life through better tire pressure retention and cooler running tire temperatures are also benefits of nitrogen use in tires versus plain old air. Nitrogen use in tires isn't merely a craze but an ongoing trend as consumers are looking for improved gas mileage. Want to add nitrogen to your existing car tires? No problem! Even if your car tires are currently filled with compressed air they can be filled with nitrogen. In order to reap the full benefits of nitrogen use in tires, the desired level of nitrogen purity needs to be achieved and any moisture in the tires need to be removed. Trained technicians will first purge the tires of the existing air and then refill them with nitrogen. What happens if there's a leak or a flat tire with nitrogen use in car tires? Topping off nitrogen in car tires with compressed air is not a problem if you run into a situation where nitrogen isn't available. Simply top off your nitrogen in car tires with air and later come back and have them refilled with nitrogen. While nitrogen use in car tires will help maintain proper pressure, it's important to regularly check your tires according to manufacturer recommendations. Worried about the warranty on your new car tires if you fill them with nitrogen? Don't be! Nitrogen use in car tires does not effect the manufacturer's warranty for the tire.