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Hybrid vehicles, which have a higher fuel economy and system efficiency than conventional gas only vehicles, has been attracting worldwide attention for its various advantages. These advantages include low emissions of greenhouse gases which mitigates direct or indirect effects on the ozone layer. LPI HEV recently developed by HMC performs with the same output level, torque and fuel economy as conventional gasoline hybrid vehicles by employing the world's first liquid-state-injection system for exclusive use of LPG. In particular, the improved fuel economy of the vehicle is expected to help cope with future regulations relating to environmental protection from exhaust fumes.

LPG (Liquefied Petroleum Gas), which has a higher content of hydrogen than gasoline, has been attracting worldwide attention for its various advantages. These advantages include low emissions of greenhouse gases and, as a result, LPG has little influence, direct or indirect, on the ozone layer. The electronic feedback-mixing system of a conventional LPG engine, however, has certain disadvantages to a gasoline engine with respect to output, air to fuel ratio control, charging efficiency and fuel economy. For these reasons, the majority of current bi-fuel vehicles in Europe employ a LPI system that injects LPG in liquid state that attempts to make up for the shortcomings of the feedback mixing system. The mono-fuel vehicle recently developed by HMC performs with the same output level, torque and fuel economy as conventional gasoline engines by employing the world's first liquid-state-injection system for exclusive use of LPG.