The U.S. is about to hit the “blending wall,” the saturation point for ethanol use, because it does not have the infrastructure to meet the federal mandate for renewable-fuels use with ethanol. Instead, a Purdue University study says, it will take significant increases in cellulosic and next-generation biofuels for the U.S. to meet the standard’s requirements. That blending wall may disappear over the horizon after the National Petrochemical and Refiners Assn. (NPRA), International ...

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