Gys i want to share my personal experience with all of you..
I bought Mehran zero meter (actually 37km) without AC model VX on 21-Aug-2010
I was on petrol no CNG Cylinder & kit was fitted. The reason for this was serius lack of cash....
The first 1000km avergar was bad that is not going above 1000km. The reason was intentional settings by paksuzuki. After first 1000 km things got really cxhanged. i always get average above 12km per liters. and please note that my daily travelling 0f 50km is on busiest routes in pindi/islamabad.
Then installed CNG on 6600km. car got heavy....... due to CNG cylinder
Thus mileage reduced to 11km..
And at the end in pakistan a mileage of car depends more on driving style, rough routes, traffic jams then other factors.. so choice is yours to decide and only a driver can better judge its car mileage