modified and strengthened the roof structure of the Flex, Fusion, and MKT vehicles, these 2010 ratings apply only to Lincoln MKZs, Mercury Milan and Fusions built after April 2010. Fuel economy and environmental performance The U.S. Environmental Protection Agency (EPA) has rated the fuel economy for the 2010 Fusion Hybrid at city, highway. The following table compares fuel economy, carbon footprint, and petroleum consumption between the hybrid version and other drivetrains of the Fusion family as estimated by the EPA and the U.S. Department of Energy: Motor Trend found that their Fusion Hybrid delivered only in of mixed driving, 5 mpg off the EPA combined rating. Over another of testing against a Toyota Camry Hybrid, the same car only achieved , while the Camry Hybrid delivered . "If our early numbers hold up, the Fusion Hybrid would be a rare instance of the EPA relapsing into the world of mileage make-believe." However, they noted that when driven very conservatively, the EPA numbers could be achieved. "In typical driving, you might as well throw the Fusion's EPA numbers out the window. But if you decide to really work at it, they're possible." Car and Driver also tested a Fusion Hybrid and achieved no more than over of driving, which was greater than the Camry Hybrid () or Nissan Altima Hybrid () though not by the margin indicated by the EPA ratings. According to Ford, the vehicle was built to have a fuel efficiency of 41 mpg in the city and 36 mpg on the highway by EPA standards. In December 2008, Autoblog Green staff reported they had obtained in-city mileage of 43.1 mpg on the streets of Los Angeles. In addition, a Los Angeles Times reporter informed in December 2008 that he had obtained 52 mpg in mixed city-highway driving with little difficulty. On a single-tank publicity stunt conducted in April 2009, a Fusion Hybrid managed on a 1,445.7 mile trip. Edmunds' InsideLine received a 2010 Fusion Hybrid as a long-term test car. Over of driving, their vehicle had only averaged , with a best tank of and a worst tank of . Reduced Electric Vehicle Operation Of 2010 - 2012 Fusion Hybrid Many owners complained to Ford about greatly reduced gas mileage after 9 years of operation because of reduced electric vehicle operation and increased gasoline engine operation. Ford notified their dealers that they are investigating a fix: TSB #SSM