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of course it's way high it's almost silly. that's why me myself, i tell people a bit higher psi can provide little more protection, but going too high and it might not be a good idea neither
Actually the proper way to determine air tire pressure is to contact, or view specs on the tires manufacture. Every tire design is different, the stickers on our vehicles is the tire psi for the oem brand tires at the oem size.
Another way is to look at the tire wear, if your getting outer edge wear then maybe tire pressure is to low, if its on the inside the psi is to high. What Jskyline mentioned is correct cold air psi and tires do expand, so its best to check them cold.