FILE PHOTO: A gas pump displays the price for E15, a gasoline with 15 percent of ethanol, and various other ethanol blends at a gas station in Nevada, Iowa, United States, May 17, 2015. REUTERS/Jim Young/File Photo
FILE PHOTO: A gas pump displays the price for E15, a gasoline with 15 percent of ethanol, and various other ethanol blends at a gas station in Nevada, Iowa, United States, May 17, 2015. REUTERS/Jim Young/File Photo