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Here they do purge with some high speed machine...all I know is that when I was air, I would have to top off every couple weeks..You can always fill tires with nitrogen initially, then top with air when needed.
Atmospheric air already contains just over 78% nitrogen, so I'm not sold on that last 22% making that much of a difference... + I don't see many applying a vacuum pump to tires in order to evacuate atmospheric air before filling with N2, hmmm...