The pressure should be inflated different depending on the time of year. I recently had my tires deflated and reinflated with nitrogen which really helps my tires hold their pressure more consistantly. Some pooh pooh it, but even my mileage has increased from 25.6 mpg to 29.2 mpg. I have an 2008 roadster and the manual and your driver door jam should indicate the presssure on front to be 32 psi and rear 33 psi. In the winter I bump this up to 34 and 36 respectively. Hope this helps.