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Ethanol adds two to three points of octane to ordinary gasoline.
ethanol basics
What ethanol is and what it does
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Ethanol is an alcohol that is used in gasoline—resulting in a cleaner-burning fuel with higher octane. Ethanol is currently blended into about 46 percent of the nation’s fuel supply.

Ethanol has been blended in gasoline for decades—and billions of miles have been driven on ethanol-blended fuels.

Corn is the primary feedstock for ethanol production. About 18 percent of the nation’s corn crop went into ethanol in 2006—some 2.15 billion bushels. Ethanol can also be made from other grains such as sorghum as well as from “biomass” sources such as corn cobs, cornstalks, wheat straw, rice straw, switchgrass, vegetable and forestry waste and other organic matter.

Ethanol offers a number of benefits to our cars, our environment, our economy and our national security:

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