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In short, yes.
31 psi is to give you a nice comfy ride. Autocross racers run more like 45 psi for better handling. We do the same, but because it lowers the rolling resistance of the tire (just like your bike tire). Sorry, your tire guy has no idea what he is talking about and is probably just regurgitating what some sales guy spewed out. The fact is the tire can easily take 51 psi without any issues what-so-ever. You will notice a harsher ride, but IMO its quite livable. I run all my tires around 50 psi.
BTW, no, nitrogen is not necessary at all. No tire requires it. Its just a money making gimmick.
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