[Anker]

The fuel door settings will cause the rears to wear more quickly in the center. To get even wear you have to lower the rear pressures much closer to the front ones, 32 PSI is a good place to start.

The lower rear pressures will give the car more neutral steering. The factory recommendation causes understeer, which is safer for incompetent drivers than neutral steering.

There are two ways to figure ideal tire pressures, One is to monitor wear, which is slow and cumbersome. The other is to measure tire temperatures at the edges and center of the tires immediately after driving enough to bring the tires up to temperature. They should be as even as possible across the tire. If they are hotter in the center you need to lower pressure, if they are cooler in the center you need to raise them.

As anyone who tracks or autocrosses cars will know, the best tire pressure varies between tire brands and models. The numbers on the fuel door are "best" recommendations from the manufacturer, intended to minimize lawsuits from idiots.

All of the above assumes that you have the right alignment!