Exactly a true statement, moisture conducts heat, and when the tire gets hotter, then the rubber becomes less for the wear. It also has the added affect of a larger molecule, which helps tires maintain the pressure longer. Another added benefit is the stable pressure gradient across temperatures, my 06 used to have the TPMS alarming about every three months in the winter, since Nitrogen, hasn't done it once. The moisture removal and the more stable pressures across the temperature spans are the best benefit. Also helps with less corrosion within the inside of the wheel, since the moisture isn't a factor anymore. Cooler tires has to be a benefit for wear, what are the numbers? Heck I don't know, I probably won't have time to commission that study, but in the aerospace industry, they use Nitrogen in all kinds of tanks, from space launch vehicles to just fuel tanks and all types of storage tanks. Why, it is inert, and will not react to other chemicals like the air that has how many different molecules and gases in it? Air, approx 78 %, and there is another 22 % of other molecules there, water vapor, the most heat conductive element of air, I guess humidity doesn't affect us either. Yes it is beneficial. Rubber oxidizes, with nitrogen that affect is less prevelant on the inside of the tire rubber. Sure all these things add up to a longer lasting tire.^^lol^^
I did it in my '08, only because I have free access to cylinders of it. The only benefit is that it should be free of moisture and may not expand/contract as much when heated/cooled. I wouldn't pay as much as some places want for it though. Only real thing I noticed was that the psi didn't fluctuate as much between seasons.