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

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These top candidates, when blended with petroleum and used in a boosted spark ignition (BSI) engine, will offer environmental benefits and boost energy efficiency all while being available at a competitive price. George, Anthe, Monroe, Eric, Davis, Ryan W., Gaspar, Daniel J., West, Brian H., Ruddy, Danial, Wilke, Trenton J.,

Engine 207
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Team from GM, Ford, FCA reviews how to calculate engine efficiency benefits of high octane fuels

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The preflame reactions are a strong function of temperature, so evaporative cooling from the fuel can also play a significant role, which is particularly important for fuels containing alcohol. Alcohol and gasoline-alcohol blends also offer efficiency benefits independent of their octane value. —Leone et al.

Engine 150