I have a GTI and with cruise control on, the speedo and my phone's gps reads exactly the same speed.
I have a Audi A3, speedometer reads ~6km/h too high compared to GPS and various "speed-showing signs" I've driven past.
alt Hacker News
I have a Audi A3, speedometer reads ~6km/h too high compared to GPS and various "speed-showing signs" I've driven past.