If you are one of those who doesn't regularly check your tire pressure, then Nitrogen is for you.
Air is composed of 1% water vapor, 21% Oxygen and 78% Nitrogen. The water vapor and oxygen escapes faster than nitrogen. Nitrogen molecules are the least permeable and stay in your tire longer. By reducing the percentage of oxygen and water vapor, your tires will maintain proper pressure longer than if you use "air". For example, with 95% nitrogen in your tires, they retain optimal pressure three to four times longer.
Proper tire pressure is very important because it can increase fuel efficiency, give your tires longer life and give you increased safety. Fuel efficiency is increased because with correct tire pressure the contact patch of your tire, that is recommended by the manufacturer remains correct, which lessens the rolling resistance and maximizes fuel efficiency. You get longer tire life because by eliminating the oxygen, you eliminate oxidation of the rubber which can make it lose strength. The safety of your tire is increased because the tire doesn't fluctuate in pressure when it is filled with nitrogen. 90% of blowouts are caused by under inflated tires.
Another benefit of using nitrogen is the improved TPMS performance. TPMS sensors go off every time there is a change in your tire pressure. Nitrogen is more consistent, so you will minimize the chances of your sensor light coming on unless there is really a problem.
Rim rust is also a problem that is caused by condensation from the water vapor in air. Nitrogen is dry, so it eliminates the potential for condensation.
NASCAR, commercial airlines, US government, food processing and packagers are already utilizing the benefits of nitrogen. Maybe we should look into the benefits of using nitrogen in our own vehicles. Spending a little money now to save money in the long run is a proactive idea. It is an even better idea when you reap all of the benefits it provides.