Hi! Ive got myself a 2015 200 cdi aut. 4-matic, and are on average 0,65 L/10 km (50/50 wide-short driving). This is on wintertiers, some on slippery roads. The 200 cdi is basicly the same engine as the 220 cdi, but is shortened down to 136hp/300torque. I am considering an engine tune-up to 175 hp/375torque. They 'promise' a lower fuel consumtion of 7 - 10%. That would give appr. your consumtion I guess. These tuning-guys also offers an increase for the 220 cdi, from 170hp(ish?) up to some 205hp.