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Mike Petraglia @TragsThe math here is 12.5 PSI at 112 degrees = 11 PSI at 45 degrees. It could be the answer and it would be legal as the rules don't forbid hot air to be used. I haven't heard 11 PSI though.
An official NFL ball is 13 psi. According to @mortreport the 11 balls came in at 11 psi