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I had my last set of tires replaced and filled with nitrogen at no extra charge by the car shop. Since it was no big deal, I didn't have an opinion one way or another. I have been in the habit of checking my tire pressure and re-inflating my tires every two months over the last year.
Since then, I have noticed that my nitrogen-filled tires hardly lose any pressure compared to the tires on my BMW which are air-filled, which tends to lose 2-3 psi every two months (on the same checking interval).
FWIW, it seems the nitrogen filled tires are definitely having a positive impact.
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