Registration data from R.L. Polk & Co., a Southfield, Mich.-based auto research firm, shows more Fords than Chevys were registered last year, the Detroit Free Press reported Monday.
As a result of Polk's data, Ford says it plans to investigate the matter.
Meanwhile, GM is standing by its claim that Chevrolet is the favorite car of U.S. residents, and Ford was careful to say it is not accusing its rival of deception.
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