It will gradually increase to 14 km/l with ac is max as shown on meter. It can go upto 20 km/l on display like on morning sunday drive at sharah e faisal.
I have tried hypermiling as well, i.e. neutralize gear on going down the flyover, less breaking and keeping rpm low by this you will get around 15-16km/l with ac. Actual mileage and mileage displayed on meter may vary. Let your car run another 1k kilomter it will improve.
Same 1.3 auto cannot give more than 11km/l with ac. I am qouting all mileages on Stock tires, bigger tires and alloys would reduce the mileage