I think it's very important to point out to readers that tires are tested to a maximum recommended pressure by the tire manufacturer. They have a significant amount of wiggle room in this. A little birdy told me that premium brands will typically over-do this by 50% this and "drive" the tire at max weight and 25% over max speed to achieve a statistically small chance of a blowout.
Over-inflation can lead to less traction, especially during a panic stop. It can also lead to blow-outs at high speed. Ask firestone about that. I wouldn't recommend going over the max on the tire. Suppose you're in a crash due to a blowout or loss of control. If someone is injured they will check the tire pressures among other things. Just make sure you understand that if you're going to over-inflate, there are risks.
-Michael
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