Regular unleaded gas.
The owners manual for a 2010 Ford Fusion Hybrid recommends 87 octane. I have ran it on 85 for highway trips, but usually use 87 octane.
The 2012 Ford Fusion runs on regular unleaded.
The 2007 Ford Fusion runs on regular unleaded.
The 2010 Ford Fusion runs on regular unleaded.
The 2009 Ford Fusion runs on regular unleaded.
The 2011 Ford Fusion runs on regular unleaded.
The 2008 Ford Fusion runs on regular unleaded.
The 2006 Ford Fusion runs on regular unleaded.
The 2014 Ford Fusion runs on regular unleaded.
The 2013 Ford Fusion runs on regular unleaded.
The 2010 Ford Fusion-Hybrid runs on regular unleaded.
The 2011 Ford Fusion-Hybrid runs on regular unleaded.