the speed factor can be programmed into the car, as noted in the post #13... the calibration factors for '06 4.8iS are given in the post #5. To obtain the calibration factors for any other specific bimmer, the programming of the odometer must be read... the police vehicles are usually calibrated to the T - so they can reasonably "clock" speedsters...

The digital speedometer is usually right on the spot, so on some newer cars, folks have programmed the digital speedo to be visible at all the times... On older bimmers that function must be invoked using the "test" sequences from the cluster...

I wonder if anyone will take a chance and will reprogram their .MAN file to show the "correct" speed... I am too chicken to do so!!!!