The ELR will run on an electric propulsion system made of a T-shaped lithium ion battery, an electric drive unit and a four-cylinder engine generator.

FORBES: Cadillac To Produce Electric Car

Coming in 2012, a hybrid version of the flagship Audi A8 sedan will team a 2.0-liter turbocharged gasoline engine with an electric motor generator and self-charging 1.3 kWh lithium-ion battery pack to realize an impressive 37 mpg.

FORBES: Sneak Preview: Audi A8 Hybrid