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  1. #1

    Default E85 Power Loss vs. Gasoline

    Pure ethanol produces 34% less energy than gasoline, but it can also be fed into higher compression engines, therefore producing more energy. Anyone done any research on this>?

    Wikipedia article on Ethanol
    Ethanol is most commonly used to power automobiles, though it may be used to power other vehicles, such as farm tractors, boats and airplanes. Ethanol (E100) consumption in an engine is approximately 51% higher than for gasoline since the energy per unit volume of ethanol is 34% lower than for gasoline.[22][23] However, the higher compression ratios in an ethanol-only engine allow for increased power output and better fuel economy than could be obtained with lower compression ratios.[24][25] In general, ethanol-only engines are tuned to give slightly better power and torque output than gasoline-powered engines. In flexible fuel vehicles, the lower compression ratio requires tunings that give the same output when using either gasoline or hydrated ethanol. For maximum use of ethanol's benefits, a much higher compression ratio should be used,[26] Current high compression neat ethanol engine designs are approximately 20-30% less fuel efficient than their gasoline-only counterparts.

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  2. #2


    What they said is true. I was a gas semi tanker driver for a Shell distributor for about three years, learned alot. E85 in a stock motor = less mpg & less power. Unless it is rebuilt (higher compression) or re-tuned way more volume than a regular Flex-fuel ecm will do stock.

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