Mine was donig around 130 - 150 km in city with A/C, before it's fatel crash in June.
It's almost 2 rupee per kilometer. Please consider: convert it only if you drive a lot of miles daily.
Installation of Lambda Control might bring it's average down, but will increase it's acceleration. Please bear in mind that leaded fuel/lower octane fuel & especially E-10 is like a poison for it's expensive Lambda Sensors & super expensive Catalytic Converter.
Best of luck!