My wife bought a new Skoda Fabia in 2002, when she collected it the dealer 'zeroed' the mileage on it. He said that with all VAG products if you hold the mileage reset button for a while (it was about 30 seconds) it will zero. The mileage has to be less than 80 miles and it can only be done 3 times. It was a while ago so it may have changed.