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In March of 2006 I paid $20 to have my tires flushed and filled with Nitrogen at Cassidy Tire. Never paid another dime since, except for a tip here & there because the guys in the shop always stop what they are doing and attend to me when I stop in for a top-up or overfill for winter hibernation.
Every Fall (mid October), for the last few drives of the year prior to winter hibernation, I usually need 1 or 2 pounds of extra pressure. Other than that, the tires never require air and are very stable over a large temperature gradient.
Just before winter hibernation, I get the tires overfilled to about 60 PSI. In the Spring, that tires are still at +55 PSI and no flatspotting. This is after +5 months of storage.
When I had new tires put on last Spring at the Porsche dealership, they used nitrogen too.
I also got 20,000 miles on my first set of Pilot Sports.
Works for me.
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