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

Green Car Congress

Their paper is published in the ACS journal Environmental Science & Technology. Alcohol and gasoline-alcohol blends also offer efficiency benefits independent of their octane value. fuel with higher ethanol content—for part- and full-load operation for different engine types and fuel assumptions. —Leone et al.

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

Green Car Congress

Experiments have even shown that the evaporation of the water in the intake manifold acts as a charge air cooling, which improves the volumetric efficiency and thereby the overall efficiency of the engine. d) further provides for alcohol blends as follows: Special provisions for alcohol blends. (1) 40 CFR ยง 80.27(d)