i think u want to enjoy waiting in long queues for cng lol...i dont know whether that it runs properly on cng or not but i suggest u to not go for cng. Firstly, cng is about to close for 3 three months and in remaining months of the year u will have to wait for hours...if we ignore all the khwari of waiting in queues, think about the engine, performance of car...
i have cng in my car but i normally drive my car on petrol coz of unavailability of (unique) cng or kilometer queues...whenever i found cng i filled up my car's cylinder but jo maza petrol pe drive karne mai hai wo cng mai nahi....
petrol k bad cng pe ao to lagta hai jaise car se dosri car drag kar rahay hai...and u said u kept on driving that on petrol since day 1 so if u forget everything even khwari of queues and all that but would u like to finish or less the driving joy and performance of ur car?