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Subject:  Re: Nitrogen in Tires Date:  12/9/2019  7:30 PM
Author:  mschmit Number:  5823 of 6572

From my standpoint, I think it is great because I despise having to put air in the tires several times a year due to temp change.

Let's say your tires are filled to 40 psi with air and some O2 escapes and your pressure drops to 36 psi. That means (approx) you started with a partial pressure of 32 psi for N2 and 8 psi for O2...half escaped and you now have 36 psi.
You fill up with air to 40 psi so you now have 32 psi N2 + 4 psi O2 plus 3.2 psi new N2 and 0.8 psi new O2...or 35.2 N2 and 4.8 O2.
Rinse and repeat once or twice more and you can see that, in theory, you'll have >95% N2, just like if you paid for it.
If your tires continue to deflate it is probably something else.

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