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Your tires will gain about 3-4 PSI from heat generated in regular street driving, more if you are driving competitively I am sure. Ambient temperature and sunlight will also affect the pressure although to a much lesser degree.
Check the pressures while cold - car not driven in several hours and has not standing in direct sunlight - then drive for half an hour, stop and check them again. These readings will be your baseline for cold and hot pressures.
If you are monitoring your tire pressures regularly you should be consistent in when you check them. I like to check mine before I drive - cold pressure. If you check them after driving, remember to account for the increase in pressure due to the heat generated from driving.
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Carrera 3.2 - "Faster, Stronger, Better"
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