FILE PHOTO: A sign advertising E15, a gasoline that contains 15% ethanol, is seen at a gas station in Clive, Iowa, United States, May 17, 2015. REUTERS/Jim Young
FILE PHOTO: A sign advertising E15, a gasoline that contains 15% ethanol, is seen at a gas station in Clive, Iowa, United States, May 17, 2015. REUTERS/Jim Young
