[Jabes1]

Ideally you want a nice even contact patch across the whole tire for best wear and mileage. If you overinflate the tire, the center wears out faster than the shoulder. Underinflation results in wearing out the shoulder with more tread left in the center. Experiment with your pressures... as a baseline go with what the manufacturer states, then adjust from there. For example, my Impreza states around 35psi for factory settings. The wheels and tires I have aren't factory on it anymore. The tires I have on it state that 55psi is max. After experimenting with pressures, I got the best contact patch and pressure at 38psi. Sometimes you can see the contact patch when the tires are on a dusty CONCRETE surface. My car is AWD so I experimented with pressures based on wear characteristics. For my truck especially the rear, Ill do a burn out and measure the width of rubber laid. Next adjust your pressures to the point of the biggest contact patch with the most pressure.