Mondeo 1.6 – 10l Fuel consumption

Hello, when I was refueling the last time I calculated the fuel consumption of my Mondeo 1.6 (90hp, step tail, year 93) and came on terrifying 10 liters at 100km. On the vehicle are quite normal 185er 14 inches (intermediately winter tires) mounted and from the driving way, I think that I drive very sparingly (roll around in the city in 5th gear, also at 80 at the latest on the country road in 5th gear and mountain underroll). Al 3km are city and the rest is country road. Mostly I drive alone and sometimes for two and rarely for five… Should 10 liters really be normal? Alex PS: How many liters does the tank of the Mondeos own