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water vapor is the big one... truly dry air might be "close enough" for people at our level.

Is anyone using Nitrogen for the tires? What do you do? I understand the tire PSI doesn't change as much but does that mean you set the initial pressure higher? Lets take the Nitto NT01s. I'm thinking they should be high 30s hot so normal cold pressure would be 30ish. If you were using nitrogen what would you set the cold pressure to?

Stick with NGK's and stay away from the platinums. I can get you the number tomorrow. I use either 5's or 6's. I think you want the heat range of the 6's.

Does anyone have any real world numbers on this? The stuff that comes out of the hose at the local gas station or home air compressor for that matter is already 80% nitrogen. Does it really make a difference?

The only difference between regular air (75-80% nitrogen) and pure nitrogen is the moisture amount which affects the rate of pressure increase. With pure nitrogen, you know exactly what the increase in pressure with temperature will be, because you know exactly how much moisture is in there. With any type of air, the moisture amount is variable, and furthermore higher than nitrogen, so the pressure change will be higher, and will also be...