My GLI 2014 model, 55,000 on odo is giving me around 14 km/l in city with full time AC. The route I regularly travel is not with bumper to bumper traffic; 50 percent of travel is in 4th gear and in somewhere between 40 to 50 km/hr with highest speed of 70 km/h.
On motorway with speed between 100 to 120 km/hr, most of the time 120, I am getting maximum 15 km/l.
I traveled last week on G.T Road, with average speed of 90 km/hr, I got average of around 16 km/l
Please note, I am very calm driver no sudden acceleration and no sudden breaking. My car is in pristine condition and regularly maintained.