Tracking gasoline prices versus ethanol prices. The pink line is commodity price of ethanol (which has less efficiency than gas, E-0). The green line line adjusts for this lower efficiency, allowing an "Apples to Apples" comparison with the commodity RBOB price of gas (the blue line). The red line is the average retail price of gasoline in U.S. As of April 20, 2012 -- ethanol is about 8� per gallon cheaper than gasoline on a wholesale price comparison....