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From a Google search. I like #4. How much does a nitrogen tire fill cost?
1. It has more mass, so it migrates through the tire three to four times slower. The result: Tires hold their psi longer.
2. It runs about 20% cooler. Less heat results in less tire degradation.
3. It drastically reduces oxidation on the rim and inner-liner (nitrogen systems almost totally eliminate oxygen -- the cause of oxidation -- from the mix).
4. It is environmentally safe.
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