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Cr did a test with 32 pairs of tires. Half the tires were filled with nitrogen and the other hafl with air. The tires were left sitting for a year. Average pressure loss after a whole year, air 3.2 psi, nitrogen 2.2 psi. Not worth it...
As for diesel_john's tires center wear, I wouldn't care about minimal center wear if my tires would make it to 110 000 miles.
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