"Graeme" wrote in message
...

Interesting numbers, how old is your car? My two year old Laguna measures
a
lot closer to the limits than that, 73mph indicated gives just about 70 on
the Sat Nav.

It's probably less to do with the age of the car and a lot more to do with
what wheels/tyres are fitted vs the range of options for the car. My car
(also two years old) has options for 17", 18" or 19" wheels. I have the the
17" wheels and the speedo reads about 10% over actual speed. If I were to
fit 18 or 19" wheels the speedo would still read more than actual speed, but
by a lot less as the rolling radius of wheel/tyre combination gets larger.
The car it replaced was 10 years old and it had (for all intents and
purposes) an identical arrangement.

--
DAS