There seems to be a misconception of what exactly constitutes an over-inflated tire. Some people call inflating their tires to 5 PSI over what's listed on the vehicle's driver's door as over-inflated. You haven't over-inflated a tire unless you've exceeded the max PSI listed on the tire's sidewall. If the tire's inflated to a level that's between what's listed on the vehicle door and what's listed on the the tire, the tire's considered to be at a safe pressure. Where you choose to keep that pressure within those parameters is completely personal preference....