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If the balance of the gas mixture were 22% O2, that would be fine with me, but what I find at most gas stations is that the "air" is a 50/50 mixture of water and air. OK, a little exaggeration, but it's my experience that water corrodes aluminum at the bead resulting in slow leaks. I've had to have tires dismounted on the Fuchs wheels of my 914-6 to prep the surface. As for my boxster, I put serious money into forged 3 piece wheels. I don't want to find out what water would do to them. The cost of N2 is small compared to all the other nonsense things we buy for our cars.
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