Quote -

Ethanol and other grain-based fuel sources might work for Brazil for a while but are impractical for a nation of 250,000,000 vehicles like the US which is not only the largest ethanol producer in the world but one of the largest producers of grain crops.  We'd need to divert food resources for larger ethanol production.  Ethanol is expensive to create and, although a reusable biofuel, could have a devastating impact in a major crop failure - not only in fuel but in food (which has never happened in the past, ever - he said very sarcastically).

Actually Brazil uses sugar cane to make ethanol, which is a much more efficient process,
as there is more sugar in sugar cane than there is in corn.  With corn it takes about as
much energy to grow and process the corn into ethanol as is gotten out of the ethanol
in energy.  Unfortunately it is too cold in most of the US to grow sugar cane.