Company Vice Chairman Bob Lutz says GM is road-testing the gas-electric hybrid drivetrain at its Milford Proving Grounds and "it is reliably meeting its objectives." That's a key milestone because sorting out the batteries has long been considered the biggest obstacle to meeting GM's aggressive time line for producing the car.
...Lutz says the next challenge is smoothly integrating the battery drivetrain and the gasoline engine. Unlike a conventional hybrid like the Toyota Prius, which uses a gasoline engine to drive the wheels, the Volt will be driven entirely by electricity. The engine will drive a generator that will charge the batteries.
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