According to what I have read N2 has a different molecular structure than O2 and diffuses at a different rate which helps in maintaining pressure,i.e. it doesn't leak out as fast. Water vapor present in your compressor air and far less so in N2 also contributes to corrosion and variants in pressure. Bottom line, regardless of the specific mechanics, if N2 was no better why would race car tires, airplane tires and numerous other high performance vehicles have N2 in their tires? As far as cost goes, anything I can do to reduce the risk of a blowout (a problem many have written about but nobody really seems to know why or have a solution for) I'll spend $10 a tire for N2 for the life of the tire. Seems like cheap added insurance to me.
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