I know this topic has been done before, but I was surprised by the accuracy of my speedo today as most owners report up to 10% inaccuracy. I was clocked officially today at Woodbridge doing 151, and my speedo indicated 151. Spot on! The old technology on the 328 is much better than the modern cars it seems. Another driver that was in a 360M reported clock speed of 180 but an actual speed of 167. Nigel.