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I think it was last year that Consumer Report did a pretty involved test with nitrogen vs regular air. They came to the conclusion that the only ones who gain from it are the ones that sell it. Because of the fact that most of the air we breath is nitrogen (78%), non of the big promises could be discovered, not even the promise that a tire needs less airing up. There is not enough difference in molecule size to make up any measurable amount.
In cases in which air needed to be refilled more than nitrogen (identical tires on identical wheels) they found that the tires that lost air were defective and allowed the air to penetrate through the rubber. Subsequently, they filled those tires with nitrogen and discover about the same pressure loss as with air.
But again, there are still people out there that want to buy a newer version of the Brooklyn bridge!
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