VW Passat manual states that the actual speed is 4 km/h LESS than that indicated by the speedometer. You can check this by accessing the onboard computer through the climatronic (climate control interface). I have checked it many times especially after changing tyres, and ALWAYS 4 km under speedometer. So, I drive speedometer, I don't get a ticket.
I also verify the speed by GPS, and it concurs.
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