Good questions regarding the accuracy. For me, yet to be done, the solution is to use my Tomtom in the car and see what speed that reads when going at a constant 100 for example. I know this is not perfect either, but it's a lot more accurate using GPS than the speedo or digital read out. And it's always interesting to see how much it is out. My Cooper S, just departed, would be doing 100kph when the speedo read 107. Our Citroen Picasso reads 103 when actually doing 100. Suspect the Golf will be nearer the Mini...
2010 R36 (MY10.5), Biscay Blue, RNS510, MDI, Electric tailgate, sunroof, Superchips remap - SOLD
2016 Octavia VRS wagon, moon white, Tech Pack, 18" black pack, electric boot, panoramic sunroof, Bluefin
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