Load out technician Slade Whetro closes the hatch after filling a railroad tank car with ethanol fuel, converted from corn, at the Lincolnway Energy plant in the town of Nevada, Iowa in this December ... more 
Load out technician Slade Whetro closes the hatch after filling a railroad tank car with ethanol fuel, converted from corn, at the Lincolnway Energy plant in the town of Nevada, Iowa in this December 6, 2007 file photo. To match OIL-ETHANOL/LOBBY REUTERS/Jason Reed/Files (UNITED STATES - Tags: ENERGY BUSINESS POLITICS COMMODITIES) less 
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Reuters | Photo By JASON REED / REUTERS
Mon, May 12, 2014 12:44 AM EDT