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'''Biofuel''' (pronounced bye-oh-FYOOL) is fuel made up of biological raw materials, such as [[wood]] or [[ethanol]].  This type of fuel is considered to be more friendly to the environment.<ref>http://www.alternative-energy-news.info/technology/biofuels/</ref>.  The main type of biofuel available in America is corn-based ethanol.  This is added to gasoline as an anti-knock compound, it replaces previously used compounds like tetramethyl lead and MTBE.

'''Biofuel''' (pronounced bye-oh-FYOOL) is fuel made up of biological raw materials, such as [[wood]] or [[ethanol]].  This type of fuel is considered to be more friendly to the environment.<ref>http://www.alternative-energy-news.info/technology/biofuels/</ref>.  The main type of biofuel available in America is corn-based ethanol.  This is added to gasoline as an anti-knock compound. It replaces previously used compounds like tetramethyl lead and MTBE.

Some biotechnology companies are pursuing techniques to produce gasoline from algae<ref>http://www.sapphireenergy.com</ref>.

Some biotechnology companies are pursuing techniques to produce gasoline from algae<ref>http://www.sapphireenergy.com</ref>.