Wayne, the Max PSI on the HCH OEM Bridgestones is 44 PSI. Running above that in the hot summer is dangerous business, risking a blowout due to overinflation.

Any HCH owner who overinflates their tires that much is risking safety for a couple of extra MPG - I would say that's not a good tradeoff.

I can safely run mine at 44 PSI in the winter, but in the summer, the heat drives the inflation pressure up like a hot air balloon. Like I said, I checked them after a short highway drive and they were up over 50 PSI.