I know what the error is and drive to that, always have done. as a general rule, i know that my car reads 100 @ 93 also. in VIC you cant get booked for going 3km over so i set cruise on 110 which equals 103km/h likewise at 110 i set the cruise just a touch over the 120 line which equates to 113

I have verified my speed with 2 or 3 different GPS units, overhead speed checks and also the climatronic display.