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Team from GM, Ford, FCA reviews how to calculate engine efficiency benefits of high octane fuels

Green Car Congress

Alcohol and gasoline-alcohol blends also offer efficiency benefits independent of their octane value. For example, a recent study showed that a transition to higher-RON (98 RON) gasoline in the US with LDVs optimized for the fuel could yield significant net reductions in GHG emissions and a net cost savings.

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

Green Car Congress

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)