FREEPORT, IL - OCTOBER 4: Signs mark the location of various corn hybrids grown for use in ethanol production on a plot of land farmed by Kevin Otte October 4, 2004 near Freeport, Illinois. Certain varieties of corn grown specifically for ethanol production have been determined to produce about 4 percent more ethanol than other varieties. A bushel of corn produces 2.7 gallons of ethanol. Currently the United States produces 3.3 billion gallons a year, by 2012 it is estimated it will exceed 5 billion gallons a year.
