My best results with my 190 E automatic are 41,52litres of 98 octane fuel for 580,50km on a beautiful empty german autobahn at a cruising speed of constantly 130 km/h with a tyre inflation pressure of 2,1 bar (front) and 2,3 (rear). If You constantly respect the economy-meter and use 10 W 50 Oil and most of all keep the car in a technically good shape, You may also reach a low fuel consumption. <br> Hope I was able to help You a tiny little bit.