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DOE Co-Optima report identifies top ten bio-blendstocks for efficiency in boosted SI engines

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Six of these blendstocks had the fewest significant practical barriers to adoption and use: di-isobutylene; ethanol; isobutanol; n-propanol; isopropanol; and a fusel alcohol blend. However, the team identified a number of outstanding challenges for the most promising blendstocks.

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Perspective: US Needs to Transition to Hydrous Ethanol as the Primary Renewable Transportation Fuel

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However, since the cost of the hydrous ethanol is significantly lower, hydrous ethanol will provide a lower cost per mile travelled, assuming the processing cost savings is passed on to the consumer. d) further provides for alcohol blends as follows: Special provisions for alcohol blends. (1)