The US became a net exporter of refined petroleum products in 2011, but remains a net importer of crude:I believe I have read that the US became a net exporter in 2011 after decades.
http://online.wsj.com/article/SB10001424052970203441704577068670488306242.html
http://www.usatoday.com/money/industries/energy/story/2011-12-16/us-oil-boom/52053236/1