I remember some years ago my uncle bought mehran as his kids drop car and he asked his mechanic to check its mileage they installed one liter bottle to it and drove it around Multan city. The car did 16 KM in that 1 Liter bottle and that was a carby mehran. Even if you buy a new carby one it will do 15 KMPL. This EFI Version will be doing 15 to 16 but not like carby this mileage will stay for years. In carby as the time goes on and carb loses efficiency and drinks more petrol.
The reason you get better pickup is due to better fuel mixture and the throttle of EFI Car's are big in size than carby butterflies.
Who ever thinks people will not install CNG well most will. I heard of some one who got CNG in his 660cc car and he gets 300 KM Local in full cylinder