Because I do get bored at work sometimes, let me make sure I've got this right. According to Mitch and Jeremy, there is no difference between compressed air and compressed nitrogen in my tire over a 30f differential. There will be a negligible difference in pressure changes one to the other. So if I set my pressure at 28psi and 170f then heat to 200f I will get the same pressure reading either way, whatever it may be?

And would an industrial oven be an acceptable test, say 20 min at 170f then 20 at 200f?

My obviously incorrect data showed 24psi hot on the warmers 170f, and 30 hot off the track at 200 with compressed air, and 28 and a little over that on nitrogen.