IMO, the 50 lbs. cold (for my tires) is NOT a hard number. There are multiple factors that should be taken into account. Before a road trip I'll do a complete tire inspection checking for cracking, tread abnormalities and finally a pressure check with a gauge taking into account what the temperature swing may be that day.

This time of the year, especially in the SE, you can still have very chilly mornings and by mid-day the outside temperature can increase 40 degrees or more. I'll...