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I don't follow this forum much so this might have been covered but I have reservations about over-pressuring tires. First, it seems to me that some of the pressures quoted on this thread sounds like a blowout in the making. Second, I would imagine that very high pressures would make for uneven tire wear, negating the savings of fuel consumption from more frequent tire changes.
For my third point I should qualify and say that I have a fair amount of experience working with tire pressures to change a cars handling characteristics, specifically in a racing environment. We can control understeer by lowering front tire pressure or raising the rear pressures. By raising the pressure, we are making the tire grip less. In normal driving conditions this is unimportant but in the event of an accident situation I want as much traction as possible to allow me to perform evasive maneuvers like hard braking or turning.
Having said that, one of the aspects of hypermiling is situational awareness which will have the added benefit of reducing the likelihood of an accident so maybe there is a balance there.
Just some points to ponder. I am all for hypermiling but not at the expense of safety.
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