Ethanol is the most popular biofuel by far. An alcohol biofuel derived from the fermentation of biomass, chiefly corn, it now represents about 9 percent of the country’s market for liquid fuels. The most popular variety is E85, which is a blend of 85 percent pure ethanol and 15 percent gasoline. More than 10 billion gallons of ethanol are expected to be included in the nation’s fuel supply this year.
Corn is the primary source of ethanol in the US; sugar cane is more efficient and is used in Brazil, the #2 ethanol producer.
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