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I am a career mechanic (30 years) and now work for our states motoring club, the RAA, as a Technical Advisor. This is something we have done some minor research into, but more is coming, like the percieved benefits of window tinting.
For standard road cars, there is no real need to use nitrogen in your tyres. There is no research performed by credible organizations that it is of any benefit to the average motorist.
If you need to pump your tyres up some where, are you going to wait until the tyre shop opens on Monday so you can go back to them to get it filled, or are you going to pump it up from the tyre pump at the fuel outlet and get on with your life?
Unless the tyre is completely evacuated and sucked down to a shrivelled up black rubbery thing, your going to have normal atmospheric air mixed in there anyway therefore bringing you back to square one.
In most cases, it is a sell up from the tyre shop, just another way of helping you part with your hard earned dollaros.
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