The bear market for crude oil is having its impact on biofuels around the globe. In the U.S., ethanol prices are higher than gasoline, putting a limit on discretionary blending above the Renewable Fuel Standard (RFS) mandate.The bear market for crude oil is having its impact on biofuels around the globe. In the U.S., ethanol prices are higher than gasoline, putting a limit on discretionary blending above the Renewable Fuel Standard (RFS) mandate. However, the spread between ethanol and gasoline has narrowed recently, making ethanol blending still profitable, especially considering the value that ethanol adds as an octane enhancer. While the precise calculation of octane value is a complex formula of many factors, the U.S. Energy Information...