The debate over tire pressures rages on. One side argues that your tires, regardless of brand, size, age or speed rating, should be inflated to the pressure that the auto manufacturer stuck on the sticker in your door jamb. The other side argues that each tire is different, so you should ignore the vehicle's sticker and go with what is recommended by the tire itself. A recent comment from Auto Repair reader Dave sums it up tightly:
Older car's psi were set when the max. tire pressures were lower than today 44 psi. In the 1980's the typical passenger tire's max pressure was 32 psi. The load rating for the tires are about the same today as 40 years ago. My Mercedes Benz 300td has the inflation at 32 psi or the max. pressure of the tire. With today's 44 psi tire, the 32 psi would be dangerously under inflated. I have a 68 year old spare that is a 35 psi max. It also had directions for a +2 psi above max. for high speed driving.
I've never had even tire wear with the auto manufacturer's recommendations. They always had extreme out tire wear even with the original tires. I use the % load to % max psi formula plus a few extra psi for more even tire wear.
Well said, Dave! I happen to agree. Read up on buying tires
and decide for yourself.