High altitude aircraft use nitrogen in tires as it is dry, deviod of moisture. The last thing you want is ice forming in the bottom part of the tire at high altitude as this will throw off the balance when landing. Althoigh the vibrations caused from this may be nominal, over a period of time the damage could be significant.

No reason to use nitorgen on your regular road vehicles. Perhaps if you live in the arctic though.

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2008 X5 4.8i BSM/Blk - premium, sports with 20" 214s, navigation, rear climate, adaptive ride, dark bamboo, running boards, 3rd row seats, USB audio, high speed maximum, etc etc

Mods: Smoked reflectors | Hoen xenon match fogs and angel eyes | LED plate bulbs | 18" winter wheels

Other vehicles: 2002 M3 Vert TiAG/Blk - with every option and many mods | 2009 Chevy Silverado LTZ - fully loaded