I managed to get 140 odd out of the ZS one night on the GPS... even thought the speedo was about 5mph higher! It was still pulling so would probably have gone a fair bit quicker... but the back straight at Knockhill isn't that long lol
I noticed over the winter that the speedo GPS difference is even bigger with the standard 17's on. A few MPH high up to 70ish and then it goes waaay out the closer you get to the ton. Fitting 18" wheels actually made it more accurate!
I have a similar problem on the Landrover, with it having such big tires the speedo is constantly at least 10mph out, so I have a GPS speedo fitted perminantly
Not had a chance to test the new machine yet... but it gets to triple figures very very quickly!
Hoping to get over to the 'ring this summer... so that'll be a good test for it
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