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Actually, if you could keep it from leaking out, helium in the tires would work better than nitrogen because it behaves more like an ideal gas. Personally, if cost wasn't an issue, I would be running neon in my tires. Argon though heavier might work better than nitrogen too.
weight of gas by liter at one atmosphere at 0 degrees C
nitrogen = 1.251 grams
neon = 0.8999 grams
argon = 1.784 grams
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