I lowered my air pressure to 38/37, and honestly, it doesn't feel as good as it did now. I'm the kind of driver that likes to feel what the car is doing and the road, so 40psi helps with that. Obviously, it also affects traction depending on the conditions of the road. Beyond that, the Mazda 3 is a lighter car with the same tires, and a higher air pressure is recommended from the factory. The interesting point here is that in reviews, the Mazda couldn't hold the skidpad or stop as well as the Subaru, and I wonder if it has to do with the car or with the tire pressure, and how they were tested. The suspension is indeed completely different so that at least is a good point against overinflating, but at the same time I can't imagine it would wear that badly on the shocks would it?