Engine weight 103 TDI

[Corey_R]

I don't trust those "side of road" speed check displays... they're often wildly inaccurate.
But if you don't have a GPS device, you can do the "trip meter reset trick". Change to the "average speed" display on your trip meter, ensure you're doing the speed you wish to calculate (i.e. a steady 100kph as indicated on your speedo), and then reset the trip metre. The first number that appears in the average speed is the REAL speed you are doing (well... as long as you're still on the standard tyres and wheels and therefore haven't introduced any inaccuracies).

This works on pretty much all VW's.
So if you're going 100kph, you reset the trip meter and the average speed appears as 93kph, you know that you too have the 7% over-read.

[Idle]

So without Sat nav, are the speed check radars used in Vic on Hume H'Way accurate? Eg, use to calculate
an offset for when setting cruise control? (With commodore around 4K diff at 110KPH, Corolla spot on)

I've run under both those and the newer ones on the Prince's Freeway near Geelong — both gave me the same reading (92K at a speedo-indicated 100) so I'd say they're pretty close.

To stay with the bulk of traffic in a 100-limit area I have to run just under 110 on the Mk6 TDI speedo — I'm slowly getting used to it, but after a couple of decades with a car that read pretty much spot-on, I still feel a bit nervous.

Whilst I can understand the thinking behind such a built-in error, I still think it's stupid.

Mentally calculating the difference helps take the driver's concentration off what he/she should be doing, which is attending to the already complex business of driving.

And to those who say that driving at the speedo indicated pace is safer, try doing it in traffic — you'll very soon tire of being tailgated and abused.