[QUOTE] Or nitrogen at £5 a tyre ....[/QUOTE] That's expensive. [QUOTE] I know it's been discussed before .... but .. [URL]http://www.kwik-fit.com/tyre-technology.asp[/URL] "Filling your tyres with nitrogen ... And by using it in a mixture with oxygen to inflate your tyres" Hmm, Nitrogen mixed with Oyxgen .. just like air then .. [/QUOTE] That's just baffling, and disturbing.