Dont be too heavy on the gas pedal buddy.
Avoid sudden knee jerk acceleration, unwanted Idling, drive in the highest possible gear at all times.
I owned it too for 2years and my City Avg was 10-11kmpl. Im a slow poke, and thus drive at a snail's pace.

100KMPH
Cruise Control on
A/C continously on enroute
Econ mode on
This pic above showd the mileage i got
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