S500/306 PS Consumption

Hello, I am currently driving an E320 Bj94, consumption in the city 14-15 l/100km – I love the car, but would have to fix some for about 6 K€ so that I can drive still 4 years. I love with an S500-W220: he has a beautiful Silhoutte, a beautiful 8-cylinder. and I drive max. 10 000km/year (Rentner halt 🙂 – so with CO2 and environment I can arrange, as I also drive 4000 km/year by bike. Question: How much super does this car need in urban terms according to your experience? Thank you for the reports