One fact that many people may not be aware of, is that airplane tires and race car tires are not filled with air. They are filled with nitrogen. This is fast becoming a common practice in passenger cars and commercial vehicles for a couple of reasons. One of the aspects of maintaining optimum gas mileage is the maintenance of the air pressure of car tires. Tires leak air, this is normal. It is best to check the air pressure once a month, as this will not only ensure that your car is getting the [...more]