A UPS delivery truck is seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of ... more 
A UPS delivery truck is seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) less 
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Reuters | Photo By MIKE SEGAR / REUTERS
Thu, Mar 6, 2014 10:36 AM EST