my idea of a perfect CNG installation:
sequential injection kit. exhaust sensor emulator for a trouble free drive. cylinder made out of composites. cylinder stand made out of wood. and if possible 50 ltr gasoline tanks should be removed from the car. the center of gravity of cylinders should be as much lowered as possible. i am sure this woud save as much as 30 percent cng.
the cng nozzles at the gas stations should be improved. when a nozzle is take out of a car after refilling a lot of gas is wasted.