I reckon around 34 is good, a little less in the rear unless carrying a heavy load. A good check for tire pressure is that there should be a 4 psi increase when hot; if less than 4 psi then cold pressure is too high, if greater than 4 psi then cold pressure is too low.
Yeah it seems like a little more pressure would make a big difference in tire wear and gas mileage. I don't have a display, but I can sure drive for a while, then stop and check. Thanks!My 2017 Impreza was delivered with the tires at 47-48 psi. I dropped them to 36-38 and run that. I have a TPMS display and see the pressure rise a few psi when I drive around town and/or park in the sun.
With my old Forester, tire wear was terrible at the placard rating and improved when I ran them in the mid 30s. MPG is better too.
My choice of tire pressures has varied but almost always ended up between 3-5 psi over recommended, landing around 34-35 psi as maximum, with one psi more in the front. Tire wear is always even.Part of each load curve standard is the point at which the load curve stops going up. For TRA p-metric standard load tires, it is at 35 psi. Equivalent ETRTO and JATMA tires peak at 36 psi.
They do that after you buy it. When they are selling they are under inflated. To be fair, cars sit on the lot for a long time and that may have something to do with it.The dealers over-inflate to give max MPG, so customers will go whoo-ah, look at the MPG I get from my new Subie!