[habmann]

I've heard of it being done. If what i remember from chemistry class serves me, the reasons for using nitrogen over air is that 1, its less affected by temperature than air meaning that your tire pressure won't change as much, and 2) nitrogen has bigger molecules which leads to less air pressure loss.

Whether using nitrogen over air is much of advantage, that i couldn't tell you. Would i pay for it over air, prolly not. I know some places will fill your tires for free with it instead of air. For free i might consider it.