The Jaguar XJ_e concept is a plug-in hybrid that will be trotted out at RAC Future Car Challenge in London this November. The Future Car Challenge is just the place to showcase a concept like this, since the event is all about the best of green vehicle technology and covers the gamut from hybrid and electric vehicles to fuel-cell cars. The XJ_e prototype is powered by a 2.0-liter turbocharged four-cylinder engine alongside a 69-kilowatt electric motor and a 12.3-kWh lithium-ion battery pack. Future challenge accepted.

The Jaguar XJ_e joins the family of efficient vehicles the automaker is rolling out, like the European-market XF 2.2D diesel engine car. The XJ_e is similar to the Range_e plug-in hybrid Range Rover Sport that was showcased earlier this year. The Range Rover Sport uses a 3.0-liter V6 along with battery power.

As for specifications, Jaguar says the XJ_e will go 25 miles on battery only and offers a combined fuel economy of 61.2 miles per gallon (on the European scale). It produces only 75 grams per kilometer of CO2 emissions – 70 percent less than the gasoline-only V8 version. The diesel XF gets 43.5 mpg on the European combined cycle. Some of the XJ_e's numbers hint at Jaguar's past, though, with a top speed of 150 mph and a 0-60 time of only 6.5 seconds.