Mann also offers no data on tight oil production and price, but here are the key facts. In 2012, according to data from the U.S. Energy Information Administration, the U.S. consumed about 18.5 million barrels a day (mb/d) of liquid fuels and produced about 11 mb/d. Only about 7 mb/d of that 11 was actual crude oil, and about 1 mb/d of that was from tight oil. The non-crude liquids the US produced have less energy content than crude, and some of it cannot be made into vehicular fuel.
One cannot easily make a case for incipient U.S. "energy independence" on the basis of 1 mb/d of new tight oil production. A host of dubious assumptions and data distortions underlie the recent energy independence forecasts which I will not delve into here, but I have examined and debunked most of the reports that Mann cites, including those from the IEA (here and here), Ed Morse at Citigroup (here and here), and Leonardo Maugeri.
Are Methane Hydrates Really Going to Change Geopolitics? - Technology - The Atlantic
http://www.theatlantic.com/technology/print/2013/05/are-methane-hydrates-really-going-to-change-geopolitics/275275/