I have a very accurate, professional grade tire gauge.....found that the cold pressure reading of my tires was 38psi....three over the rec. When I was rolling .... checked the pressures via the dic info page and they were up to 41!!!! So.....took the cold pressures down to 35 and now the "hot" rolling pressures are up to 37/38....much better road feel!
I did read somewhere that many vehicle manufacturers over inflate the tires prior to transport.....but the dealer should have checked that and taken the pressure down. The other important aspect of this is that these are "low profile tires" and they will "heat up" quickly and pressure will rise much faster than "normal ratio" tires! ....get a good gauge and check those pressure readings....better ride, better tire life!!