Everybody talks about 80% of nitrogen in air.
Well, those people are not aware about the actual benefits of filling nitrogen in tires.
Kindly note that, the 80% of nitrogen you get along with the air do also contain water vapor, because majority of the air filling shops do not have a dryer or the one that works properly to make it dry.
AFAIK, the concentration of nitrogen in the compressed "nitrogen gas" that we are filling in our tires are also not 100% pure nitrogen and it contains some percentage of oxygen in it. But definitely its DRY and there wont be any water vapor in it.
Comparing to normal air which contains about 20% oxygen is more prone to oxidization(Even though newer tires are far more resistant to oxidization.)
I use to experience 2-3psi loss of normal air within 2 months. never had similar experiences with nitrogen.
I use nitrogen for the following reasons.
*I need my tire to last longer years, because considering my vehicle usage even after 5 years my tire threads are not going to wear out
. So what i need is more healthy years.
-Due to the absence of oxygen, tire oxidization wont be so quick and helps the tire to last longer.
*For me nitrogen filling is not expensive.
-I got free nitrogen fill up while upgrading my tires.(anyways it just cost Rs.200)
Nitrogen top ups are free during wheel alignment works. In other times, i just need to pay Rs.10 for the topup and sometime even that too free
(From where I brought my new set of XM2 tires)
*Less driven vehicle tend to lose air faster.
-Is this a right statement? But it happens to me.
. Where as I didn't experience the same with nitrogen filled tires.
Myth
*Nitrogen filled tire results in much better fuel mileage.
-A properly inflated tire (either nitrogen or air) will results in almost same amount of fuel consumption.
IMO, if you can get DRY compressed air and if your vehicle usage is high, then go with normal air itself and be sure to keep them up properly inflated by regularly topping up so as to get better thread life.