On my tires it has a max psi of 44. I always set it at 38. Everytime I take the car in to firestone for an inspection they lower it to 35. They tell me it is the manufacturers recommended psi. When I drive with it this low it feels like the tires grabs and pulls on every groove in the road. When the psi is 38-40 I don't feel the grooves as much. What psi are you all running for a daily driver? Thanks.