The following cars represent the most technically advanced available.
The 2015 Volkswagen Golf GTE remixes the GTI's 200-hp output with a plug-in hybrid power-train, blending performance with 130-mpg efficiency.
Pricing not available
BMW went back to the drawing board to come up with the i8, a car with three motors, four seats, all-wheel-drive, and a swooping exterior that's straight out of the future. Our first impressions on the road.
The 2014 Audi A7 TDI includes some of the best connected tech available today in an automobile, and those inclined to put up with a few diesel drivetrain quirks will be rewarded with significantly higher fuel economy than from the gasoline equivalent.
Volvo expects to launch its first plug-in hybrid, an SUV, in the US next year.
Volvo's premium "sport wagon" will get over 120 miles per gallon on an efficient diesel engine and powerful electric motor.
Green Car Reports spied a diesel Range Rover in a parking lot in Bristol, England, plugged into a charging station.
Volvo announced it will begin sales of its diesel-electric hybrid plug-in V60 model for the European market next year.
Volvo is about to blow rival hybrids out of the water with a diesel plug-in V60 estate that will produce nearly half the CO2 emissions of a Prius.
With diesel fuel economy and its wagon format, the 2013 Volkswagen Jetta Sportwagen TDI offers great utility, and adds a premium-car feel, but cabin electronics only cover the basics.
Volvo's uber-frugal V60 Plug-in Hybrid just took a step closer to reality. The 150mpg motor will go on sale in November 2012.