If nitrogen holds tire pressure better, and since air is 80% nitrogen, any leakage would have to be the oxygen, CO2 and other gases. The remaining air in your tire would then be a higher percentage of nitrogen. If you refill with air at 80% nitrogen the new gas mixture in your tire would be more than 80% nitrogen. Over a period of time with numerous air top ups your tire would contain mostly nitrogen and you would get it without paying for nitrogen. I just can't believe nitrogen reduces leakage.
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