Yes really Bro ...
Last days my father had Open heart surgery from Doctor Hospital Lahore ... And i visit Lahore approx 4 time in a month.. And those days CNG was Of for two months i think ... perhaps in December , January ..So i use to come from Bahawalpur to Lahore , 430 KM approx distance , And it consumes approx 22 liter of petrol , i have tested it approx 4 time as i quote earlier ... So that's my experience , .. My car engine in in very fine condition , 1.5 years complete overhauled , Oil change at 2500 Km , Havoline CNG ....