Haveread many conflicting post on various forums about the VW speedo error and how to correct
HAve conducted a series of test on my Tig and Caddy and sumit the following. All over same straight 13k only 1 dogleg over parallel railway line


Caddy default pulse setting 1
pulse......GPS k/h....GPS KM.....Speedo..ODO...S%error......D%error....DIFF%
22188/1.....95............13.0........100.....13.0....+5 .26%..........-0%....5.26%
21848/4.....89............13.0........100.....13.9...+12 .35%.....+6.92%....5.43%
22532/7.....97............13.0........100.....12.7....+3 .09%......-2.30%....5.39%


Tiguan default pulse setting 4
21848/4....94.5..........13.0........100.....12.99....+5 .82%......-0.08%....5.90%.
22532/7....103...........13.0........100.....11.9..... -2.91%.....-8.46%....5.55%

I leave it to the experts to interpret