George Bright wrote:
This is normal. Most manufacturers want to make sure that speedos are on the low end accurate or optimistic on the high end of tolerances.
Yup. Having spent plenty of time driving a car with a rally computer, I've seen this in every one of them. Generally, at 55-65mph, about 3-4 mph low. And it gets worse as you faster, it's not 3-4 all the time.. Driving at an actual 75 mph on the rally computer will seems about 82 on the speedo. Above 100 (this was the RX7) was about 10mph off.
Anders