Ethanol is blended in about 50 percent of the
nationís gasoline supply.
According to the U.S. Department of Agriculture, ethanol yields 1.64
units of energy for each unit of energy it took to produce. That
compares to just 0.8 units of energy from gasoline.
In 2007, ethanol use in the U.S. reduced C02-equivalent greenhouse
gas emissions by approximately 10.1 million tons, equal to removing
more than 1.5 million cars from America's roadways. Also, ethanol
reduces tailpipe carbon monoxide emissions by as much as 30%, toxics
content by 13% (mass) and 21% (potency), and tailpipe fine
particulate matter (PM) emissions by 50%
The American Lung Association of
Metropolitan Chicago credits ethanol-blended reformulated gasoline
with reducing smog-forming emissions by 25% since 1990.