I'm having a tough time accepting serious improvements from N2 over (dry) air - given the equally common air on the outside of the tire.
Water vapour will make a difference, especially when it transitions between the gas and liquid phases due to temperature.
One of my previous cars sat mostly disused for nearly 2 years.
Its rear tires stayed on long enough to show signs of rubber rot and cracking on the outside , but when they got replaced, the insides were just about as pristine as the new tires.
Why not fill up the tyres with atmospheric CO2
