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any alcohol in gasoline reduces mpg. as a ase certified technician i am seeing a lot of this now. customers complain of lower gas mileage and worse performance.

The answer is, quite simply, yes. The Foundation for Economic Education reported:

"Corn-derived ethanol yields 35 percent less energy than gasoline. So as the percentage of ethanol in gasoline goes up, miles per gallon will go down. Translation: Our demand for gas has gone and will continue to go up thanks to this government-promoted biofuel program."

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