Well....for those who use their car 4 travell/outstation work, this might be good bcoz the saving u can get is almost more than 50% compare to petrol (full tank is around RM9 and can give u up to 150-180km) and the payback is only take less than a year. If ur car is dedicated only for working purpose, I think 50% off ur luggage area is nothing since u r not going to utilize ur boot 100%. The con is limited no of refuelling center but the system is dual fuel, u change to petrol when u out of the gas by switch only. I'm considering this NGV bcoz I found few NGV station which has very few taxi/car go there to refuel. One more thing is my company has offered 24 month int free installment for those who to install NGV kit (for staff only hehehe...)