What are the benefits of nitrogen-filled tyres?

I have the advantages of pure nitrogen in tyres from a leaflet from a tyre fitting centre. What in your view are the disadvantages? At £2.50 per wheel it seem at first to be a no-brainer but your view would be welcomed.

Asked on 29 June 2013 by GT. Via email

Answered by Honest John
Michelin says there is no tangible advantage for everyday car use. Air is 88 per cent nitrogen anyway.
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