The competition is thickening on the plug-in front, with vehicles from Honda Fit EV, Nissan Leaf, CODA Sedan, Toyota RAV4 EV and Prius Plug-In making their appearance on showroom floors.

FORBES: 2013 Chevrolet Volt - Not Quite Electrifying

The HondaLink family also includes HondaLink EV, specifically designed for the all-new Fit EV all-electric vehicle and the upcoming Accord Plug-In Hybrid.

ENGADGET: Honda announces its HondaLink infotainment system, teams up with Aha Radio for the festivities

While it's a larger car than the C-MAX Energi, it weighs about the same and features pretty much the same plug-in hybrid powertrain with 195 net horsepower and three EV driving modes.

ENGADGET

The centerpiece of Project i are the i3 pint-sized EV vehicle and the flashy i8 plug-in hybrid supercar.

FORBES: BMW's Project i And The Future Of Fun, Sustainable Mobility

Atlanta EV infrastructure is building as more plug-in electric vehicles become available.

WHITEHOUSE: Advanced Vehicles: Advancing Our Communities

With the Chevrolet Volt, Chevrolet accounts for more than 50 percent of all plug-in electric vehicle sales in the United States and Spark EV builds on Chevrolet's proven electric motor and battery development programs.

ENGADGET: Chevy details 2014 Spark EV: under $25,000, 0-60 in 8 seconds and a 20-minute fast charge

The top speed in EV mode is 85 miles per hour, which is 25 mph better than the Prius plug-in.

FORBES: C-Max: Ford Makes A Great Car -- And Gets Slammed Anyway

"EV drivers want to pay their fair share, " says Jay Friedland, legislative director of Plug-In America.

CNN: New taxes make electric vehicle owners pay their share