Hello! I would like to know which consumption values are normally displayed at constant speed around 120km/h at the S320CDI (model year 2008) (naturally somewhat windless and flat, normal 235 tyres, no summer heat etc.). Strangely, the value always starts at 8,4l/100km after reset and then falls slowly. Should you be able to get below 7l to 100km if the engine is OK? KW