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in theory, a tire looses pressure due to a loss of O2 through the rubber. Apparently the rate of N2 loss compared to O2 loss is 1 to 3 or 4. So a tire initially filled with nearly ure N2 will maintain pressure longer, therefore improving safety and mileage of all of those maintenance inept drivers of the world.
Assuming that pressure loss is only attributed to permation of O2, for those of us that maintain pressure by regularly filling with normal air will eventually have purer N2 than what will be supplied by a N2 vendor which is likely just around 95%
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