The U.S. government has been searching for domestic fuel sources to reduce dependence on foreign oil. For the past few years, a primary source has been ethanol, an alcohol produced from corn and other agricultural products that, when blended with gasoline, reduces the fuel's costs and increases octane. In 2004, about one-third of U.S. gasoline contained a 10 percent to 15 percent ethanol blend. Today, that figure is approaching half as more states require 10 percent to 20 percent blends.
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