Diesel motors are not allowed for Athens.Yianni your car is brand new!I understand your excitment but wait for at least the first 2000 km to break in the engine.It is the most important procedure for your new car.Use the auto mode at the beginning and keep the revs up to 2500 until you reach the first 500 km,then 3000-3500 rpms until you reach 2000 kms.You have enough torgue for urban traffic.Try using the car for a change to highway with a steady speed and
revs not higher than 2500-3000 and use the obc to see the readings on consuption.I am confident it will be reduced.