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According to the 2011 Ford Fusion Owner Guide : It has the Motorcraft BXT-96R-500 battery with all engine sizes ( BCI group size 96R )
The 2011 Ford Fusion has a 2.5 L base engine size.
The 2011 Ford Fusion has an inline 4 engine.
The 2011 Ford Fusion-Hybrid has a 2.5 L base engine size.
The 2011 Ford Fusion-Hybrid has an inline 4 engine.
It will be a metric size. Try different sizes until you hit upon the correct size.
The 2014 Ford Fusion has a 2.5 L base engine size.
The 2012 Ford Fusion has a 2.5 L base engine size.
The 2013 Ford Fusion has a 2.5 L base engine size.
The 2010 Ford Fusion has a 2.5 L base engine size.
The 2009 Ford Fusion has a 2.3 L base engine size.
The 2008 Ford Fusion has a 2.3 L base engine size.