Fuel consumption Audi 100 2.3 Quattro? buy?

Hello! Since my Golf II is a bit rusty, I have to buy a new (old) car. 🙁 (And I had just got used to my GTI…) I have an Audi 100 2.3 Quattro in my eye. Looks really nice, 200 TKM but neither airbags nor climate. Year of construction was not on it. The model was built afaik until 91. Only I am worried about the fuel consumption. What do you think, how much should I expect with moderate driving? Actually, I would also like a et what smaller car like an old Golf III can do, but the Quattro is really exciting. 🙂 My head says 90 HP Golf III, my belly says 136 HP Quattro. What do you say? Bye-bye. Jochen .. who can always make a difficult decision.