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Knoll, et. al.3 tested 16 conventional vehicles using splash blends of ethanol in certification gasoline and showed a linear fuel economy decline with ethanol.
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This is counter to what some forum members have been saying.
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...(E10) will have about 3.3% less energy than the base gasoline, a 20% blend of ethanol in gasoline (E20) will have about 6.6% less energy than the base gasoline...
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...E10 resulted in a 3.7% decline in fuel economy and E20 resulted in a 7.7% decline.
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