I was curious and did some reading. Check it out! Makes me remember college. 
http://en.wikipedia.org/wiki/Nitrogen
I guess according to this website Nitrogen would leak out of tires more slowly than air. Still, I wonder what benefit you would get for normal cars? I guess you don't have to check the Nitorgen in the tires very often (almost typed air). Where would you get Nitrogen to put in tires anyways? Airgas suppliers?
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Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper!
Cameron Frye Ferris Bueller's Day Off 1986
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