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Air is mostly (78%) nitrogen. Pure 100% nitrogen though is dry, no moisture so less expansion under heat. This is probably very useful in a high performance tyre\speed situation where tyre temperature can get really quite high but for 4wd and the like not of much use to be honest. Track cars like to go that way, your big V8's on Bathurst, F1, production racers at the top end etc..
Says the previous owner was a bit of a purist possibly. Don't know how hard it would be to find Nitrogen supplies in Aus. Your local garage certainly won't have it online.
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