Tracking gasoline prices versus ethanol prices. The pink line is the 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 May 25, 2012 -- ethanol (adjusted for efficiency) is 8� per gallon higher than gasoline on a...