...in your tires!!

"The primary advantage of nitrogen in tires used for racing is that tire pressures change much less with changes in temperature. As the race tire slides across the pavement, it heats up, causing an increase in pressure. Nitrogen-filled tires don't build pressure as much, thus tire pressures are better controlled for optimum performance.

That same advantage works for street tires as well, particularly this time of year. Tires filled with nitrogen won't decrease in pressure as much as air-filled ones when the outside air temperature drops. Remember, air-filled tires drop roughly one pound per square inch for each 10-degree drop in temperature.

Secondly, nitrogen is moisture-free, meaning less condensation and corrosion inside the tire -- including the wheel itself. Thirdly, nitrogen tends to be less prone to leakage through porosity of tires and wheels.

The additional claims you mention are spin-offs of the three basic advantages. "Cooler, less fuel, longer life, fewer failures and improved handling" all revolve around the reduction in pressure loss over time with nitrogen. If motorists kept their tires properly inflated with air, those issues would be far less significant.

The bottom line? Nitrogen is a good thing for your tires. And better tire shops are now offering and using nitrogen to inflate tires."

http://www.startribune.com/131/story/151177.html


Edit: Hmm... maybe this should be in the Tire forum?