My wife's Mazda3 was sold with nitrogen in the tires.

I spoke with a service advisor at a Mazda dealership today.

I asked the guy what the deal was, since I had to top off her tire pressures the other night.

He said that they actually pull a vacuum before inflating with nitrogen.

That "should" get rid of any water vapor in the tires, similar to pulling a vacuum in AC lines, I would think.

He wasn't sure of the cost but it sounded substantial from what he said: "$79 or $99."

I did check into the cost of a tank if I bought one from a local gas distributor; $165 would buy me a 60 cubic foot tank filled with dry nitrogen, which is about 3 feet tall, and would cost $37 to refill.

That doesn't include the regulator (I don't think) but eBay has several choices.

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic