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A while back I had 4 new tyres on a previous car and the chap at kwik Fit 'gave' me a free fill of nitrogen.
Got the car home and not trusting the pikey fitter thought I had better check my pressures to the ones on the door frame. Surprise surprise there was a variance of up to +/- 3lb difference in pressure to what it should have been. Having put the pressures 'right' I decided never to trust a tyre fitter to put in the 'correct' pressure again. Paying for the privilage of too little or too much nitrogen is just crazy.
As has been said - it only really has a place on aircraft or in top end motorsport where tyre temp stability is more crucial.
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