I run 40 PSI in the fronts and 38 PSI in the rears. It was recommended by my alignment guy. I've been checking wear pattern with my tread depth gauge and they all are wearing evenly straight across. The ride is a little stiff, but it sure goes around corners nice for a big car.

 

40 psi all around. 7000 miles even wear 8/32" front 6/32" rear - time to rotate. Slight feathering on outside of fronts.

 

40 psi since today as the alignment specialist recommended me (was keeping 32 before). Just beginning to enjoy the new ride after the lowering and alignment process due to the new Eibach Pro-kit. I prefer the better handling and general performance that I get from now.

 

I decided to try 35PSI *cold*. Since the rule of thumb is you add +4 for extended speeds over 100MPH (that's Germany people, not the 55MPH US) It firmed up the tire respnse but not the upper suspension. I plan on leaving it there for a while.