A Gas/Electric Hybrid Engine combines an electric engine component with a conventional internal combustion engine that burns gasoline. The Toyota Prius is a common example of a car that features a gas/electric-hybrid engine. These types of vehicles offer better fuel economy than traditional cars because the engine isn’t powered exclusively by gasoline. Regenerative braking, which converts the vehicle’s kinetic energy into electric energy essentially “recycles” energy that recharges the battery without wasting gas. This kind of car also reduces emissions because little exhaust escapes when the car is idling.