i get an average of 15-16 km per ltr. Own a 2D Saloon 2005. done 11000km on it. did two oil changes one oil filter change. thats all. bought it one year back, no smoke, excellent pick, did over 140km per hr on motorway at approx 3500 rpm (perhaps a bitmore....).
i also own a charade 84 genuine diesel oguht it in 85 first owner. that car gives me 18km per litre. maintainence on that is oil and filters thats it. but a few things like wiper motor, foundations, ,shocks (front), timing belt, glow plugs etc. have been changed / repaired once.
p.s. diesels last longer than petrol engines. tried & tested.