I wanted to see how accurate my speedo was, so I did exactly 40mph (indicated on my speedo) through the speed trap and it said 35mph!
So Im wondering if this is why people sit on my arse all the time - when I'm doing 30mph, am I really doing 25mph?!
I've timed my standard 320 at 9.1 seconds to an indicated 60mph, which was probably more like a true 50mph

