The Ford Fusion Energi offers a robust plug-in electric system in an ultra-popular roomy full-size sedan platform. The model offers the equivalent of about 100 miles per gallon, without compromising style or passenger space.

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Hyundai takes on the plug-in competition with a powerful motor, six-speed automatic transmission, and a battery pack providing about 27 miles of all-electric range. It's packaged in the attractive and comfortable Sonata mid-size sedan.

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The Honda Accord Plug-in Hybrid is pricier than its PHEV competition, but it comes in a very popular design, with more passenger space and lots of power. The plug-in Accord offers an impressive efficiency rating of 115 MPGe.

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