Now more and more Tire Factory locations are offering a nitrogen tire filling service. This new technology is gaining in popularity as an alternative to oxygen-filled tires. Together with oxygen, nitrogen is a component of the air we breathe. However, this odorless, non-toxic gas has a larger molecule than oxygen so it cannot escape as easily through porous material such as a rubber tire wall. A tire filled with a higher percentage of nitrogen leaks at a much slower rate than one filled with oxygen. The benefits of nitrogen-filled tires include: Maintains Proper Inflation 3-4 Times Longer, Fuel Savings, Increased Safety, Longer Tire Life, Superior Handling, Decreased Wheel Corrosion.