Trackseeker: I am assuming you do not have the nav option. It seems the clock for non-nav cars was an after thought! The clock in nav units stays spot on as the time is updated by the nav unit which aquires its information from the orbiting satellites.

It seems that P did not use a quartz based crystal in the non-nav units. So.. time drags behind on those units. It happens to ALL of the non-nav cars.