Ten clicks out

THE speedo in my 2008 Golf is an average of 10 per cent out. My dealer tested the car and said it was fine. When I approached VW Australia it suggested adjusting the computer from the winter setting. This apparently lowers the speedo by 10 per cent for ``snow driving''. The problem is, my Golf doesn't have the full computer and couldn't be adjusted. VW basically said ``stiff cheese'', because by law the variance can be up to 10 per cent. What can I do? I generally have to guess my speed if I want to do 100km/h and hope the 110km/h I am showing is 100km/h.