I'm just going to say this.. then I'm out. When I bought my 04 the previous owner thought 40 psi was where they should be "cause it's on the tire".. There was probably 3/32 more wear in the middle of the tires than the sides by the time to replace them. Tire wear speaks volumes. I run them at 34-35 and tire wear is pretty uniform. And I don't feel every twig I run over.