All good but fuel mileage i10 sports automatic 1.2l

I have a 13500 km driven i10 sports 1.2l kappa2 automatic version of October 2011 make. The ride is smooth,engine noise is very less.AC is ok.Looks of sports version is also appealing.People sometimes stop by and ask for which model.etc.Only let down is mileage.While buying an automatic transmission version ,the buyer already has made up his mind that he is ready to compromise a few km's per.liter (normally 2 km's per liter lesser than a manual car).I was also ready for that but this one goes below that.I have got a 16+km/liter average only once in 1 and half year of ownership when I bought it at 9000 km mileage from a NRI.My averages of fuel averages of these 4500 km driven by me has to be around 10.5 km/liter.If I drive onlong routes with controlled conditions(ac off) ,being very gentle on acceleration it does give 12 to 13 km /liter but normally in city traffic conditions with ac on it disheartens with as low as 8.5km/liter to maximum 10.5km/liter.Now I come to know that why in 6 years of ownership the previous owner has run in for 9000 km Only(though he was a nri ,the another major reason probably).I have told to local authorized dealer too while getting the car serviced but I was told that in automatic version they hardly have anything to alter with .From looks or trouble free running of engine I am totally satisfied but from fuel average aspect I expected a minimum of 11km per liter and on long drives atleast 14+ fuel average but it only managed to give me 16plus average once when I drove it like I am driving a eriksha.Had to accelerate slowly under rpms of 1200-1500,had to keep all windows closed,got filled extra premium petrol,and used ac on off or use very rarely,If I have accelerated the car once I did not use the brake till last Moment in hope that the power generated by engine is used till last meter.All this did increase the risk of accident chances as you are not using brake in anticipation and waiting till last second.I finally was very happy that the car managed to gimme back 16 know against rated 16.7km per liter by hyundai at highest rated.Other than fuel mileage their are hardly any concerns.Lil unwanted noise does come from ac grills and door windows plastics.But all in all 4/5 for car and on fuel mileage front it has to 2.5/5