the .cng.ngo.cng .S.till a bargain.cng . Still a bargain .The running cost of a CNG auto is less than half that of a petrol auto. Thus it will always be more profitable to use CNG. Fuel Price (Rupees) Kilometerage (Kilometres per unit of fuel) Price per Km (Rupees) CNG 12.20 per Kg 37.5 per Kg 0.33 Petrol 28.84 per Litre 27.5 per Litre 1.05 .igl.mcum .igl .igl.igl .lpg .cng.cng .cng .cng .cng .cng .amicus curie.cng