On the 04-05 we only get an overall status like Durk says, ours don't know the actual PSI, only knows changes (and only alerts at a 12PSI change from reset). On the 07-08 it shows all 4 tires at actual PSI in pretty much real-time.

ALSO the DIC shows the mileage, but the PCM will still have the correct mileage stored. He's only breaking the law if he tries to sell or title the car with the wrong mileage listed.