Speedo Accuracy

[matt2]

As far as I know, all car speedos over-read your actual speed but my GTD is far closer to the real speed (as tested by independent GPS) than any other car that I have owned.

In my Mk 6, the over-read varied depending on the speed that you were doing but at 74 indicated, you were really doing 70.

On the Mk 7, it seems to be a constant 2 mph over-read, regardless of the speed that you are doing.

Has anybody else tested their car to see what it does?

[AlanH]

Comparing my speedo against my TomTom, the speedo seems to over-read by 3mph at all speeds.

[mk7gti]

There used to be a way on the Scirocco to bring up true speed on the AC unit display. I wonder if the Golf can do the same trick...

[ffrank]

This seems to tally with the more accurate MPG readings, if assuming MPG and speedo are using the same data for miles.

[dippy_x]

If I set cruise at 75mph TomTom usualy hovers between 72-73mph

[Ginagee]

I've been worrying that my GTi has been underestimating speed. We've got a few of those warning speed detectors round our way, and keeps flashing at me to slow down when I am at or under the speed limit. I've decided that these things are just not calibrated correctly.

[Skinnee D]

If I set cruise at 75mph TomTom usualy hovers between 72-73mph

That's the same for my speedo.

I also checked the odometer and that was virtually dead on (actually under-registered by a fraction of a percent over 10 miles).  Having established that I checked the fuel computer a few times with the same filling technique and that was consistently just over 1mpg optimistic.

All in all pretty good really.