Factory Specs on Tire Pressure?

Good rule of thumb is 30,32 or 35psi for all passenger tires. just because the sidewall says max psi is 51 or 44 etc does not mean thats needs to be the operating pressure, I have people come into work all the time with their tires at max pressure and wouldnt' you know the center of the tire is starting to dish out hmmmm. i wonder why. Follow the door sticker unless the tire size is different from factory.

Most common tire pressures
For all 4 ply passenger tires. 30, 32 or 35 Psi without a load, Depending on vehicle application and tire size/type.
For 6 ply Lt Tires 30, 35 or 40 without a load, Depending on vehicle application And tire size/type.
For 10 ply Lt tires 60 or 70 Psi wiithout load, Depending on vehicle application and tire size/type.

Most common tire wear issues due to improper tire inflation assuming the vehicle is aligned.
Worn sholder edges or rounded sholders indicates underinflation.
Worn center or dished out center indicates over inflation.