Besides common sense, a degree in civil engineering (highways emphasis) and reading car magazines for 40 years I offer these quick references.


From NADA
http://www.nada.org/PrinterTemplate....ontentID=14267

Check your tire pressure at least once per month, and especially before a long trip. Remember underinflation is a tire’s number one enemy, because it can cause damage that may lead to tire failure. However, overinflation can cause uneven wear plus handling and stopping problems. Use the manufacturer’s recommended air pressure listed on the sticker of your vehicle’s door jamb or owner’s manual as a guide. Always check the pressure of your tires when they are cool or cold. Driving heats up tires and make the reading incorrect.

From GM:
http://www.gm.com/company/gmability/...ou/manual.html

If your tires have too much air (overinflation), you can get the following:
Unusual wear
Bad handling
Rough ride



Car and Driver
http://www.caranddriver.com/dailyaut...fety-tips.html

However, overinflation can cause uneven wear plus handling and stopping problems.