I drive on European roads (more corners) on 195/65R15 tires with 2.8bar = 40PSI
/manufacturer's recommendation - 2.3bar/
I read in extreme economy mods' test in a car magazine (Autobild) that for fuel economy it is advisable to over-inflate max +0.5bar than manufacturer's recommendation -
so as not to lose from ride comfort and safety
and that max sidewall inflation or more will lead to a faster tyre sidewalls' wear - as said before me!
But strangewierding - my 17" set (exactly the same size - 225/45R17):
the tyre workshop advised me to inflate them directly to 2.8bar (40PSI) -
as a lower profile tyre needs a higher pressure to compensate ...
In my opinion on this size 40PSI is not over-inflation - but normal
