From the law of physics...yes! This has been a point of many discussions over the years..."Why does NASCAR do it? The day that a NASCAR crew chief proves in "black and white" that Boyle's law is wrong, then and only then will I accept that compressed nitrogen expands differently than any other compressed gases when subjected to heat. Why is it used in earth moving tires? Think about that for a moment. That's a lot of "big rubber there." The larger molecules in nitrogen do not pass through the rubber as fast as atmospheric air or pure O2, thus no need to be servicing the tires all the time. NASCAR? When the tires come up to temperature, they expand so does the grain of the rubber, so the larger molecules will slow the escape of pressure. That's the only explanation I think why it's used by NASCAR. I'll finish with this. I can air up two tires on one of of our planes with identical pressures. (checked with a calibrated pressure gage) One with nitrogen and one with "house air. Let the plane sit for a month or two (nothing uncommon) and check the pressures. The tire with house air, will need to be consideralbly serviced and the one with nitrogen, may need a little.