well oxygen causes oxidation. Oxidation can make rubber brittle and cause it to lose tensile strength. In addition, at high temperatures and pressures, oxygen reacts and damages inner tire liners and belt packages; nitrogen does not. and yes it does increase fuel economy proper tire pressure is a big deal and the advantage with the nitrogen is that it last longer and holds air longer in the tire which keeps ur recomended tire pressure set. u also benifit from it saftey wise because alot of blowouts are due to under inflated tires and nitrogen provides a more reliable pressure to decrease ur chance of a blowout. its really not about the nitrogen its about reducing oxegen water vapor and other gases.lol and by reducing these u maintain proper pressure..
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