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One one hand, we have the HUMMER H2, which is pretty much the least green vehicle on the road; indeed, if the Prius is the standard bearer by which others are judged, the H2 is the pallbearer. On the other hand, we have liquefied petroleum gas. LPG, as it's more commonly referred, burns much cleaner than gasoline and just about any internal combustion engine can be converted to run on the fuel. What happens when you combine the two?