Just wondering how accurate the A3 speedo is, compared with satnav/GPS readings? I was in a borrowed 1.6Fsi Golf to Manchester and back this weekend, using a borrowed Tomtom. Assuming the Tomtom is accurate, the Golf's speedo was hopelessly inaccurate. An indicated 55mph was a true 50mph. An indicated 90mph was a true 82mph. So this thing was right on the 10% limit for speedo accuracy. I ended up ignoring the speedo and looking at the Tomtom readout.