HOLDEN uses a dual-fuel gas-injection system developed by Impco. I am a fan of gas-injection systems because they are less prone to the driving problems that can plague the older venturi-mixer systems and make them a nightmare to drive. The dual-fuel Holden hasn't been a big seller mainly because fleets prefer the dedicated LPG Falcon. The dedicated LPG system means drivers can't switch over to petrol to get better performance and driving capability. But if you are a private owner, I would choose Holden's gas-injection system.