I still remember a Top Gear topic going back to the original Top Gear (before May and Hammond) where the compared two Golf Mk2 GTi's, one with delivery mileage and the other with 80k and both in standard spec. Sat them at the begin of a runway and the blasted them off the line and the 80k car was a whole lot quicker and Top Gear said stated that VW's of the time aren't really run in until 80k!!!