Renault 19 – Fuel consumption

Hi together I have a Renault 19 – 1.8L with 110 hp and the fuel consumption is the HORROR ! I drive in the city, 50 zone often in the 5th walk with eta 1300 turns…. or in the Leeergang rolling when times go downhill or it is possible to save petrol ! But the smells like an animal ! I have to fill up every 9 days, drive every day to work about 50km (incl. traffic jam on the way home) Unfortunately I have not yet calculated the consumption but I would appreciate it on about 11-12 liters ! W he looks at you ? thx, ciao