July 2, 2012 at 2:11pm by Alexander Stoklosa This weekend’s Goodwood Festival of Speed may not seem like the venue to debut a plug-in hybrid concept car, but hey, it takes place in Britain and Jaguar is a British company, so why not? In addition to running a prototype F-type roadster in Goodwood’s hill climb event, Jaguar brought along an experimental XJ sedan powered by a plug-in hybrid powertrain. It’s called the XJ_e and Jaguar claims it vastly outperforms the regular XJ when it comes to fuel economy. In place of the standard XJ’s six- and eight-cylinder gas and diesel engines, the XJ_e gets the turbocharged, 2.0-liter four-cylinder from the Range Rover Evoque , an eight-speed automatic transmission, and an electric motor. Jaguar says the electric powerplant puts out 93 hp, and is fed by a 12.8-kWh lithium-ion battery. Total system output is 329 hp—Jaguar doesn’t specify the four-cylinder engine’s output, but it makes 240 hp in the Evoque—and the large-ish battery pack can propel th

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