Consumption of the C2 110 HDi FAP

Hello C2 driver! Are there other C2 drivers driving a 110 HDi? I am interested in what consumptions you can achieve. I have been driving about 8500 km with my C2 since the beginning of April (new car). The factory consumption information for the country road can only be achieved if I crawl into the A……… for a truck at 80-90 km/h. Despite reserved gas feet, it is hardly possible for me to achieve the mix consumption. My average over the distance to date is just over 5 liters N. Unfortunately, I did not get a satisfactory statement from my (really) friendly Citroen dealer. What experiences have you had?