In my experience of driving this car for 65k kms, the average shown on meter is instantaneous and does not reflect accurate figure.
I travel on M2 every 2 weeks and here is my car's average with AC (calculated manually upon each refill).
Under 100km/h > 17.2 km/l (It is a mental torture driving at this speed on motorway)
110km/hr > 15.8 km/l
120km/hr > 14.5 km/l
130km/hr > 13.3 km/l
In city, with AC, no matter how lightly I drive, average stays around 9.5-10.5 km/l