I love the sales pitch for Nitrogen filled tires: It's what NASCA, F1 and airplanes fill their tire with! The reason those organization fill with nitrogen is two fold. Yes nitrogen is more stabile and consistent than air and secondly - more importantly - when the tire catches on fire, the nitrogen doesn't feed the fire like straight air would.
So the primary reason is safety.
__________________ My Porsche mechanic drives a Saturn. '98 Artic Silver w/ Tip
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