VW Speed Reading vs GPS Speed

[team_v]

Already been covered a million + times.

Every newer car has an error built in to the speedometer that shows a reading about 4-8km above the actual speed to reduce liability in case of accidents.

There is some setting you can change via vagcom to get it to read the "correct" speed.
There is also a multiplier setting that can be changed to affect the distance travelled i believe (Logger would know more about it)
Alternatively you could just run different sized tyres to make up the difference.

[Rocket36]

Like has been said, covered heaps before...

Speedo reads slow. I'm doing 110kph when my speedo indicates 120kph.

I just go buy the engineering mode in the HVAC display for accurate speed.

The odometer is accurate though. No reason to worry about travelling further than you have.

[audineil]

I checked my R36 and:

Indicated 60kmh = GPS 57kmh
Indicated 80kmh = GPS 77 kmh
Indicated 110kmh = GPS 106kmh

Neil