A hybrid car refers to a vehicle that has two sources of power: gasoline and electricity. Today's hybrids combine a gasoline engine with one or more electric motors (and a traction battery pack). In the automotive sense, this is a vehicle that has a gasoline-powered engine and an electric engine that work together to deliver better gas mileage, usually 40+ mpg. The batteries are recharged by systems like regenerative braking. The 1999 Honda Insight was the first commercially available hybrid; the Toyota Prius became the first popular hybrid car.