At the dawn of the automobile age, Henry Ford predicted that "ethyl alcohol is the fuel of the future." With petroleum at about $65 a barrel, President George W. Bush of the United States has embraced that view, too. But Brazil is already there. Brazil expects to become self-sufficient in energy this year, meeting its growing demand for fuel by raising output both from petroleum and ethanol. Already the use of ethanol, derived here from sugar cane, is so widespread that gas stations have two sets of pumps, marked A for alcohol and G for gasoline.