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This is an excerpt from an old technical service bulletin (TSB). Although the main purpose of the TSB is not relevant to us (we are a tropical country), there is a valuable part in it that is relevant to us. Everyone knows that tire pressure increases when a tire heats up, but we do not know its numerical value. This graph is a good solution for that ..... (Its true that this is for few Toyota models but we could use this until we find a most suitable one for other models) Let us forget the ambient temperature difference axis (Axis 5) in this graph and consider only the points where the 0 F line intersects (0 F line along the axis 4). This gives a clear idea of how much more air pressure needed depending on the temperature variation of the tire in the three cases 1,2,3 when we inflate the tires. For example: In case of Cold Tire - Recommended psi value is required In case of Warm Tire - 2 psi more than recommended is required In case of Hot Tire - 4.5 psi more than recommended is required Note: Normally, the sticker pasted on door jamb shows the recommended "cold tire pressure" . Please find full TSB by this link for your further reference. https://attachments.priuschat.com/attachment-files/2015/10/96267_T-SB-0345-08.pdf