New Citroën C4 puretec 130 Max (BJ.2024) too high consumption

Hello dear community, I am unfortunately not getting ahead with the dealer or the manufacturer of my new leasing vehicle. At the beginning of October 24 I received the petrol engine and, unlike all test reports and YT videos, I have too high consumption: Key data: 3 cylinders petrol E10 Moderate driving Mode of standard 18 inch rims city and highway rides in Berlin Consumption should be under realistic conditions still under 6 L / 100 km. i 9 L! Current KM stand is new about 1000 KM Recently, I ran out of gasoline during the ride, because you don’t seem to get any more values on this vehicle below 30 KM tank level… Since then, I have a continuous consumption of 8.5 L, which should still be too high. Have you had similar experiences, or is there an explanation what it might be about? This is my first Citroen and was leased by me especially because of the low consumption. with different SUVs (e.g.BMW x3), where I was very “agile and still never got over 6-7 liters. The new 220 hp and heavier vehicle. Hope you have an explanation.