This photo taken June 20, 2013, shows a sign advertising no ethanol gasoline available at a station in Oklahoma City. A high blend of ethanol gasoline, E15, which contains 5 percent more ethanol than the 10 percent norm sold at most U.S. gas stations, is sold in just 20 stations in six Midwestern states. Sales could spread as the Obama administration considers whether to require more ethanol in gasoline; it's cheaper and cleaner but it could damage older cars and motorcycles. And American Petroleum Institute, the oil industry's powerful lobbying group, has asked the Supreme Court to block it's sale. The Court may decide as soon as Monday, June 24, 2013, whether to hear the case. (AP Photo/Sue Ogrocki)

Associated Press
This photo taken June 20, 2013, shows a sign advertising no ethanol gasoline available at a station in Oklahoma City. A high blend of ethanol gasoline, E15, which contains 5 percent more ethanol than the 10 percent norm sold at most U.S. gas stations, is sold in just 20 stations in six Midwestern states. Sales could spread as the Obama administration considers whether to require more ethanol in gasoline; it's cheaper and cleaner but it could damage older cars and motorcycles. And American Petroleum Institute, the oil industry's powerful lobbying group, has asked the Supreme Court to block it's sale. The Court may decide as soon as Monday, June 24, 2013, whether to hear the case. (AP Photo/Sue Ogrocki)
This photo taken June 20, 2013, shows a sign advertising no ethanol gasoline available at a station in Oklahoma City. A high blend of ethanol gasoline, E15, which contains 5 percent more ethanol than the 10 percent norm sold at most U.S. gas stations, is sold in just 20 stations in six Midwestern states. Sales could spread as the Obama administration considers whether to require more ethanol in gasoline; it's cheaper and cleaner but it could damage older cars and motorcycles. And American Petroleum Institute, the oil industry's powerful lobbying group, has asked the Supreme Court to block it's sale. The Court may decide as soon as Monday, June 24, 2013, whether to hear the case. (AP Photo/Sue Ogrocki)
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