Seen it advertised, and read some reports in rags.
Sort of understand that it gives better distribution of heat as tyre heat builds up during use, theory being single gas no differing thermal rates, so even heating of the tyre; bit that gripes me is nitrogen's 79% of the air we breath, so they really are only shifting 20ish% of other gases, don't know the chemistry of O2 and N2, but for my money I'd use air and by a pint with the change.
Also it ain't on the service station forecourt for a top up.
I do admit that i got involved in similar theory whilst diving (especially in cold UK quarries) for deep long duration cold dives with long deco stops we'd use pure argon in a small (1litre) cylinder to inflate our dry suits, it offered better thermal properties than the compressed gas mix we breathed, and it certainly came as a shock to the body if the argon ran out and you had to swap back to main gas supply
Nigel
it also stops moisture and helps prevent corosion of alloys as oxigen free nitrogen absorbs 50% of any moisture in the tyre its put in
