The National Highway Traffic Safety Administration (NHTSA) has decided to test plug-in vehicles separately from gas and gas-electric hybrid versions of the same models, no doubt to make sure that the extra equipment (battery, power electronics, charger, etc) doesn't make plug-in models less safe. The 2013 Ford Fusion Energi was one such plug-in to get crash tested, and it passed with flying colors, receiving the highest possible safety rating of 5 stars.
This isn't too surprising considering that the hybrid version of the 2013 Fusion also received 5 stars from the NHTSA, but it's still useful information for potential Fusion Energi buyers. Good to know that going plug-in doesn't compromise safety.
The Fusion Energi has an EPA-rated fuel economy of 100 MPGe combined, 108 MPGe city, and 92 MPGe highway. Note that those are "MPG-equivalent", so real-world performance will vary a lot depending on whether your driving patterns keep the vehicle in electric mode (the Energi has an electric driving range of 21 miles/34 km) for significant portions of your trips or not. You should still get good fuel economy during longer trips, but obviously it's the short trips that can be made in electric-mode that will give you the best results.
The Fusion Energi plug-in thus joins the Chevrolet Volt plug-in in the NHTSA 5-star club.