Always use the VEHICLE manufacturer suggested PSI. If you want to experiment, I would stay within 10% + or - of the reccomended PSI.
Of course this only applies to the OE Tire size, and OE Tire Load rating.
The TIRE manufacturers MAX PSI rating is not what you use in the tire.
It is kind of like saying your stomach will hold 4 cheeseburgers max, but you will be safer, and have a more comfortable ride with just one cheeseburger.
I run 34 psi in mine
I think over inflation will cause the center of the typical tire to wear faster.
and with mazda5's rear camber, the wear will be on the inner side.
You say DO NOT USE this PSI but don't go higher or too low ... If Mazda recommend this pressure why not just put that pressure in your tires ?!!?!?
You say DO NOT USE this PSI but don't go higher or too low ... If Mazda recommend this pressure why not just put that pressure in your tires ?!!?!?