This technology, developed and used by BMW, borrows heavily from hybrid cars. When decelerating or braking, the car captures the kinetic energy and converts it to electricity. This electricity is used to charge up the car's 12-volt battery, making it unlikely the engine will need to generate extra electricity to keep the battery charged. BMW claims that this technology can increase fuel economy by 3 percent.
Example: 2011 BMW X3
September 29, 2011 5:04 PM PDT
Photo by: BMW
| Caption by: Wayne Cunningham
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