@Vinayak
I too own a petrol fiat linea in delhi, the average consumption displayed is 7.7 and if the avg. is measured with the traditional method (tankfull to tankfull) it gives 12.
I went for the first servicing of the car this week itself and explained this issue to service ppl, they replied it might be a problem with the display meter, as the engine setting was perfect . They checked the engine with an equipment termed as examiner, this was nothing but a laptop wired to my car's engine which checked for rpm setting.
This whole process was done in my presence. I think this is the same problem which you are facing.
Moderaters any comments..
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