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I know Mythbusters has lousy control in their fuel economy tests, but they did a test with various PSI and while above sidewall rating did yield slightly high mpg. The real margin for improvement was getting above the typical American driving around on unchecked tires at 20psi. If you want good tire wear, good handling and good mileage, your best results are somewhere between the driver's door plackard and the sidewall max. The closer I get to sidewall max, the more it feels like someone greased my tires. They don't break loose, but it feels a little sketchy. I drive less aggressively during the winter anyway, so there's no harm, IMHO, in running them high when the roads are dry and dropping them down when the roads are icy. If I lived where we had continuous winter, I'd just suffer with lower mpg, but I don't, so I won't. Our typical storm comes in, drops 6" on Sunday, it's melted off the roads by Tuesday.
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