BERLIN (AP) -- Germanyamp;apos;s Volkswagen, already reeling from the fallout of cheating on U.S. emissions tests for nitrogen oxide, said Tuesday that an internal investigation has revealed amp;quot;unexplained inconsistenciesamp;quot; in the carbon dioxide emissions from 800,000 of its vehicles - a development it said could cost the company another 2 billion euros ($2.2 billion)....