I run 35/40in both mine all the time - #s easy to remember and seems to work well regardless of load or driving style. One car gets pushed hard, the other is a DD and kid transporter, one is stock with 355 HP and the other modded with 475.

 

Note that 33/37PSI is referenced to 68F. If when you set the pressure the ambient temp (actual tire temps with a car stopped overnight) is 88F set it at 35/39 - roughly a 1PSI delta per 10F difference, or follow the table below: