Audi 80 “ABK” , consumption 10L / 100km OK?

Dear Audi-Community, For about 1.5 years now you have an Audi 80, year 1994 ABK and for about half a year I have noticed the following: Consumptions about 10L on 100km with moderate driving mode (U/min at an average of approx. 2500-3000). Move my Audi usually about 50% on the road, 40% in the city and 10% on the highway. The cooling water temperature does not move above 80°C except in the traffic jam (between 90°C – 100°C). Can this multi-busch lie alone on the thermostat? For I know an average consumption of 8 L to 100 km for this motorization. Oil consumption about 1 L to 1500 km. I am grateful for every hint ! Thank you and love greetings from Switzerland