what should be the pressur in all 4 tires?

 

There should be a tag inside the driver side doorway that states your tire pressure that is required. Or it may be on the tire.

 

FWIW, I have found the pressures on the door jamb to be bogus. When I filled my tires to the recommended 30 PSI the ride was pretty squishy and it was hard to keep the car pointed straight at highway speeds. I keep 33-35 PSI which gives me better control. Interestingly, the manual recommends 35 PSI for "high speed driving" over 100 MPH. YMMV, of course.

 

Start with what is listed on the door jam sticker. Of course, these numbers are for the stock tires. Still, I'm not sure if I'd pump them up much higher with ultra-low profile tires, since I like to keep my kidneys intact.....

 

35psi is a safe bet.