Originally Posted by UK ken
Did not relize that Aircraft and Racing cars to name but two..used Nitrogen to inflate their tyres, rather than compressed air.
I noticed its now available from certain Tyre Outlets for Joe public to use i.e purchase. The claim is an improvment in comfort of ride..fuel saving ..tyre life and safety...personally I can't see it should make any difference if you keep your tyres correctly inflated.
Any one tried it?
UKKen.

Air is 78% nitrogen, 21% oxygen and 1% argon, so that only leaves 2% for other gases.
Filling your tires at the gas station with a compressor that may or may not have a moisture separator on it, is the reason some tires end up with visible water in them..
The main advantage of nitrogen, an inert gas, is the low moisture content, nitrogen is used industrially and moisture is virtually totally removed during its processing. The absence of oxygen which (naturally) causes oxidization is also good.
If nitrogen passes through rubber less easily then it is a very minor benefit.
In cold weather you would not notice any difference in the frequency of the TPMS light coming on. If it comes on then you need to put air in your tire(s) period.
An initial fill with nitrogen is good if done cheaply enough. After that top ups with air will be fine in my opinion as you will only be adding a small percentage of air which is mostly nitrogen anyway.
Like many things on the market nitrogen is hyped, benefits yes but your choice.
The comments expressed above are solely the opinions of the author who takes no responsibility for the content, which may or may not be utter rubbish.