[Quartz]

Here’s the non Wikipedia answer.

I'll get blasted by loyal nitrogen users for this but..........It's just another way of separating you and your money. It is useful in racing and aircraft, but of marginal effectiveness in passenger car (or truck) tires.

Some claim that normal air (and the oxygen in it) causes the rubber in you tire to deteriorate. What they fail to consider is that the entire outside of the tire is still sitting in normal air that contains oxygen. Sunlight is the real killer of tires (other than wear). Pull an old dry rotted tire off the rim and the interior always looks much better than the outside.

Others claim that the moisture level in compressed nitrogen is lower and keeps tire pressures more stable when the tire heats up. Dehumidified air will do the same thing, but honestly we don’t drive race cars where a half pound of tire pressure makes a big difference in the way the car handles.

Lastly nitrogen is nonflammable. Boy, I sure am glad to hear that! Now my worries about my tires spontaneously combusting are over.

If nitrogen was so good, every gas station in America would be selling it at ridiculously expensive prices.

Here’s a few links
http://auto.howstuffworks.com/question594.htm
http://ezinearticles.com/?Selling-Ni...-Air?&id=38142
http://www.bargaineering.com/article...s-mileage.html