A2, 1.4TDI fuel consumption too high!

Hello together, since August I have now also an A2 1.4TDI. Unfortunately I am very disappointed with the fuel consumption. With the summer tires205/70R17 I have always used 6,2 to 6,7 liters/100km, short distance, long distance (50-100km) mixed. Now with the winter tires 155/65R15 it is not much different. Otherwise the bowl runs like a one! Another problem is the tailgate. In sunshine it sometimes happens that the flap cannot be closed by slamming. Furthermore, there are about 2000U/min of fibration noises from the ashtray area, but who knows exactly!?!? To the equipment: EZ.01/02, leather seats with seat heating, radio, climate control…