http://www.autoblog.com/2012/07/30/2...k-spin-review/
The reviewer describes a Mercedes E300 station wagon, powered by a diesel electric hybrid powerplant. The diesel part is the 2.2L turbodiesel with about 360 ft lb of torque; the electric motor can add up to 180 ft lb. A 7 speed transmission powers the rear wheels. Result: An observed 44 mpg (US gallons) during the test drive. Not bad for a 4400 lb vehicle!
The electric part of the equation is interesting in its small size. The Lithium Ion battery pack and components to recharge it adds only 200 lb. The electric component is able to power the vehicle by itself only for 1000 yards. But it has enough juice to help start the vehicle rolling, and to keep moving in stop and go traffic.