Very bad Fuel economy

I have been driving Tata Zest XM model from june 2015. I bought ZEST from

Most of the reviews are fake here. Even some impressed me before I could decide to buy.

Firstly, I waited to for first free service  and then waited for 5000 kms to complete for getting exact Mileage. THis is what I am dying for these days. See, you think less cost and buy this ZEST then petrol cost, you would paid in next 2-3 years can impact your pocket. I don't know about diesel variant. 

Look and Style: Very modern look and style.

Comfort: Very comfortable and made for Indian roads.

Pickup: Can beat even BMW.

Mileage: Like Trucks, 8.6 to 8.9 litre/KM in city drive specially in Bangalore traffic for Petrol version. I don't go or drive on Highway everyday. I drive for office everyday.

Best Features: Multi Drive, its really cool feature.

Needs to improve: Mileage.

Overall Experience: If you don't talk about Mileage then best car to drive on Indian roads and a great suspension for rough roads. AC power is also good.

I drive my tata zest xm petrol from jhansi to delhi without taking rest and i got overall performance is good but i got only 12km/l fuel econmy so if anyone can efford 9km/l in city and 12km/l on highway than can buy otherwise diesel versions are batter than petrol

I want to say to tata motors that they have to do something else for fuel economy otherwise as usually tata to tata hi hai.