Petroleos Mexicanos , facing a 10th straight year of production declines , is including water in its oil output and may revise previously reported data, according to a company official briefed on the matter. A record gap this year between reported output and what the state-owned company processes is partly explained by measuring systems at older fields that are unable to differentiate water-heavy oil from actual crude, the official said, asking not to be named as Pemex debates reducing figures for the past three years or more. Last month, the company cut its 2014 output forecast to 2.44 million barrels a day. Pemex, which is preparing to form partnerships with private producers for the first time in seven decades, produced 2.48 million barrels a day through June, while its distribution system processed 2.32 million barrels a day, according to the National Hydrocarbons Commission . The commission didn’t give a […]