Corn Ethanol: Growing Food, Feed, Fiber ... and Fuel?

Corn ethanol is being used more and more as a fuel, but important debates over feed crops, food prices and the fuel efficiency of various biofuels may limit its future use.

How-To-Boost-US-Fuel-Economy
A 1.1 mpg increase in passenger vehicle fuel efficiency would save as many gallons of oil as all the ethanol produced today. 
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