Keep it up, My Car used to give 200+ in one cylinder, and nowadays i get only 150, Actually how i used to get it is a very interesting story, My advancer/emulator was also pumping fuel when running on CNG , i realized that my needle of fuel also dipping slightly after every CNG run , so i investigated , I was actually spending twice the price (combined Petrol + CNG), After i replaced the faulty part, the CNG ecoonomy dropped but my injector leak was resolved so i am happy now @150 km per cylinder.
You should check it too!!