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Last year, when 4.3 percent of gasoline was ethanol, vehicles got 1.4 percent less miles per gallon than they would have on non-ethanol gasoline, she said. This year, with a mandate of 6.3 percent, the average MPG will be reduced by 2.1 percent, she said.
From The Volokh Conspiracy
When we assume the ethanol production process is fully renewable, it would take all the corn in the country to displace about 3.5 percent of our gasoline consumption — only slightly more than we could displace by making sure drivers’ tires are inflated properly.
Even small diversions of corn supplies to ethanol could have dramatic implications for the world’s poor, especially considering that researchers believe that food production will need to triple by the year 2050 to accommodate expected demand.