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I once rode around horrible roads in Ireland for 3 days in a C class rental at 4-6 bar(~60 psi+, can't remember exactly) - it was a rental and I had no reason to check until a low tire pressure warning came on and I checked it at a gas station. The folks there were all dumbfounded. Quickly lowered to around 2.2 bar and carried on. Only noticed slightly softer ride.
So for those of you running high - tire wear might be an issue but the tires can take it. They say to increase pressure by 10psi for extended 100mph + driving. You aren't going to pop a tire at 40 or even 45 PSI unless you're running the ultra low profile minimum tire width for a wheel width or something.
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