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The GM/U Mich patent envisages using multiple free-piston engines (240A through 240D in the patent drawing). Fuels can include gasoline blends, and alcoholblended hydrocarbon fuel grades. Ethanol blended hydrocarbon fuels can include higher ethanol blends (e.g. Click to enlarge.
A team of engineers from GM Powertrain, Ford and FCA have published a detailed review of how to estimate the engine efficiency benefits of higher octane fuel—e.g., Alcohol and gasoline-alcoholblends also offer efficiency benefits independent of their octane value. —Leone et al.
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