Why Wal-Mart wants to sell ethanol
E85 is available at only a tiny fraction of gas stations. But Fortune's Marc Gunther says the giant retailer is poised to change that.
NEW YORK (Fortune) -- More than 5 million vehicles on U.S. roads today can run on ethanol - a renewable fuel that comes from corn - as well as gasoline. General Motors (Charts), Ford (Charts) and DaimlerChrysler (Charts) recently announced plans to double their annual production of so-called flex fuel vehicles to two million cars and trucks by 2010.
It's the single largest commitment to renewable fuels in the history of the auto industry - a good move for the automakers, and for the planet, too.