Chervolet volt concept

Chevy Volt is designed to move more than 75 percent of America's daily commuters without a single drop of gas.3 That means for someone who drives less than 40 miles a day, Chevy Volt will use zero gasoline and produce zero emissions.2

Volt has a revolutionary propulsion system that takes you beyond the power of the battery. It will use a lithium-ion battery with a gasoline-powered, range-extending engine that drives a generator to provide electric power when you drive beyond the 40-mile battery range.
How the Volt works:
The Volt runs only on electric power until the battery runs down. Then and only then does the internal combustion engine kick in but not to propel the car but to feed the onboard generator that produces electricity while the car is operating. The electricity is then stored in the battery. Energy normally lost in braking also is recaptured and sent to the battery. The batteries can also be recharged by plugging into an electrical outlet.
By GM's calculations, the Volt would save the typical driver 500 gallons of fuel a year, amounting to a net cost savings of $900 (assuming gas costs $2.40 a gallon). The addition to a home electric bill would be about $300.
GM engineers have designed the E-flex system so it can be tailored to meet the specific needs and fuel infrastructure of a given market. For instance, the E-flex system might use 100-percent ethanol in Brazil. In Sweden, it might use biodiesel made from wood.

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