What are the benefits of nitrogen-filled tyres?

My local ATS is offering to inflate my tyres with nitrogen as an alternative to air. What are the benefits of doing this, as the cost is not very much?

Asked on 5 March 2011 by WB, Brighstone, Isle of Wight

Answered by Honest John
It is supposed to retain pressure better and run more quietly. But, of course, the air that you breathe is 78.09 per cent nitrogen.
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