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The 2011 Chevrolet Express pictured above features General Motors' fully integrated compressed natural gas fuel system. Though that CNG setup is exclusive to Chevy Express and GMC Savana cargo vans equipped with the automaker's 6.0-liter V-8 engine, there appear to be more light-duty CNG-fueled vehicles from General Motors in the works.

Between 2000 and 2009, the United Parcel Service (UPS) increased the fuel efficiency across its fleet of 60,000 delivery vehicles by a relatively remarkable ten percent (with more on the way). Part of that boost is attributed to UPS' extensive deployment of alternative fuel vehicles, like the 48 Kenworth-built, liquefied natural gas- (LNG-) fueled heavy-duty trucks that the delivery company will soon add to its fleet.