After reading the complete thread yesterday, I have decided to go for LPG. So today I have got filled 6KG in my Margalla 1300cc from G9. Car converted to CNG without any issue and pick was quiet better and was almost equivalent to Petrol. The mileage which I am getting currently on CNG is 25Km/Kg (200KMs in 8Kg, without any doubt) on Islamabad - Rawalpindi track and on petrol 12-13 Km/L. Could anyone please give me a rough idea that how much should I expect from LPG.
I have driven the car for about 25 KMs on LPG today at speed of 60-80 and there was no issue of idling or missing or freezing.
Thanks to all members for sharing their knowledge and experience, especially Chaudhry Sab and Azhar_isb and Asim.
Saad