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" In a speech before members of the International Motor Press Association in New York, David Friedman of the Union of Concerned Scientists commented that &amp;quot;there&amp;#039;s no silver bullet for improving our dependence on oil.&amp;quot; His remarks echoes what PM&amp;#039;s Mike Allen wrote in our May 2006 cover story. But Friedman was optimistic about the possibility of greatly increasing fuel economy. &amp;quot;We have the current technology needed to double the fuel economy of today&amp;#039; vehicles.&amp;quot; He also noted that in order for us to be able to fuel our fleets on biofuels, would require the country to &amp;quot;double the yield per acre of feedstocks and double the efficiency of extracting fuel from those feedstocks.&amp;quot; And, he noted, various studies have shown no definitive link between fuel economy and vehicular safety.\u2014Don Chaikin Earlier: How Far Can You Drive on a Bushel of Corn? The Truth About Biofuels Fuel for Thought: One of these fuels is not like the other. PM crunches the numbers on alternative energy sources.  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/a726/3062741/>