When Fiat SpA paid off $7.6 billion dollars in debt to the US and Canadian governments this week, they effectively raised their ownership of the Chrysler Group to 46%, leaving the US government to own 6.6% while the Canadians now hold 1.7%; but according to a statement filed to the US Treasury department Fiat plans to purchase the 6.6% held by the US government before the end of 2011.