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A friend of mine gets his tires inflated with nitrogen because he was told that tire pressures would only need checking every 6 months, and that unlike air they will run cooler and give better fuel consumption and longer tire life. I will be interested in your comments.

If you are in the habit of checking your tyre pressures, then there's no need to use nitrogen. The only fuel consumption and tyre life advantage we have been able to prove is based on tyre pressures. If you keep the pressures maintained in accordance with the manufacturer's recommendation, you will get better fuel consumption and longer tyre life. It seems to us that it's a bit of a money spinner for the tyre outlets.