Oh, and one more thing. Nitrogen is 78% of the atmosphere, but oxygen is 21% and argon is .93%
Both oxygen and argon are larger molecules than nitrogen, N is actually at the lower end of gasses to keep from seeping through the polymer chains, but it is its inertness at temperatures found inside a hot tire with pavement reaching 1 50 degrees that is the benefit.
You and I actually agree, except perhaps on the % of N in the atmosphere. I was only using one significant figure - you went to 2. ;-)
I’ll stick with my point — that if you keep your tires to the point that dry N as your inflation gas matters, then you have likely kept your tires beyond the designed life of the carcass. Truck tires are an exception, as are aircraft tires.
And your clarification about a drier on the compressor is valid. I was just referring to jobsite compressors for hand tools, not shop tools.
I’ll stick with air and fresh tires ;-) and skip the N in my passenger tires.
p.s., and CO2 is about .04% of the atmosphere, but that’s for another thread. ;-)