I don't think he's kidding, as many people have said, they're running about the sidewall max rating. I myself run 50/50 in my 44 max tires with no ill wear or handling effects.
However, I do think this thread needs the standard tire disclaimer of "you attempt this at your own risk, and before going out on the highway with higher inflation you should test to make sure that your handling in normal and emergency situations is as good as it used to be. Find a parking lot and stomp the brakes or slam a hard turn to make sure you're not losing critical traction."
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