Just saw the post, I run:
38psi cold all around--- in orange county the roads are pretty good but if they were not, I might run 40psi...
2013 Mercedez Benz SL63 AMG Diamond White
2013 Porsche 991 Carrera 4S Carrera White
2013 BMW M6 Alpine White
2012 Audi R8 V-10 Ibis White
2012 Mercedes Benz C63 AMG Black Series Obsidian Black