Alan Mulally, president and chief executive officer of Ford Motor Co., speaks during the unveiling of the Ford Fusion in New York, U.S., on Tuesday, Sept. 18, 2012.

Ford CEO Alan Mulally has said it himself: Fuel economy is the number one factor for people when deciding what car to buy. Just a few days after Mulally made that claim while making the rounds on morning TV shows, the miles per gallon (mpg) ratings of two Ford hybrid models are being questioned.

Consumer Reports says it tested both the Ford Fusion Hybrid and the Ford C-Max Hybrid and found both models got 8-10 miles per gallon less than the automaker promises.