Cars and fuel pumps in the United States can easily handle gasoline with 10 percent ethanol or less, a blend known as “E10.” But if we started mixing even more ethanol in that gasoline — say, moving up to 15 percent, or E15 — it gets trickier.

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The worst U.S. drought in half a century has hampered the country’s corn production and caused plenty of worry about the rising cost of food worldwide. Should the United States suspend its rules that divert a hefty portion of the U.S. corn crop into ethanol fuel for cars and trucks?

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