Why CNG is still not the ‘fuel of choice’ for private vehicles?

CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL CNG OUTLETS IN METROS DELHI MUMBAI AHEMADABAD HYDERABAD 179 PSUS 153 62 4 OMC's PSUS HPCL 85 33 MGL 13 OTHERS IGL BANGLORE CHENNAI KOLKATA NIL NIL NIL