"If every acre of corn were used for ethanol, it would replace only 12.3 percent of the gasoline used in this country, Hill's study said, adding that the energy gains of corn-produced ethanol are only modest and the environmental impacts significant."
-quote from Jason Hill, lead author of the University of Minnesota study.
If fuel consumption was cut by a third or more by using hybrid vehicles, the
12.3% previously mentioned would triple to 36%.- from me.