"charles" wrote in message
...
In article ,
sm_jamieson wrote:
On Tuesday, September 29, 2015 at 1:26:18 PM UTC+1, Dave Plowman (News)
wrote:
In article ,
brightside S9 wrote:

Manufacturers will normally deliberately calibrate their speedos to
read 'high' by some amount between 100% and 110% to keep themselves
within the law.

It also means the car shows a higher top speed than reality. Better
MPG.
And needs servicing more frequently. So a win win win for the makers.

In these days of pulse counting speedos, there is no need for the same
sort of tolerance as once. Only thing which will effect the reading is
tyre wear - which makes it read on the 'safe' side anyway.

--
If your sat nav indicates speed, it is interesting to see the difference
between that and the car speedo.

in my case: 73 on the speedo = 70 on the GPS

Within 2mph on my speedo vs sat nav on my van until I get past 80mph then it
gives a 3mph discrepancy all the way up to 110mph.

The works van speedo is 5mph out at 70mph and a full 7mph out at 110mph.



--
Adam