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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.