This is great, providing you trying to save money on gas, rather than save the planet.
This car is a combination of a regular car powered by fossil fuels and the electric car. By using electricity to also propel the car, the amount of gasoline used has been significantly reduced.
However, you will not be any more "green" by driving this car, in fact you may be less so.
Think about where that electricity came from, most of the means that the US gets its electricity is from coal or from burning some type of material. In fact, the only truly "clean" form of energy production that is relatively mainstream is nuclear.
Seeing as nuclear only accounts for about 17% of the total electricity in the USA the odds are good that the electricity used to power your "environmentally friendly" car, is a lot more harmful to the environment than your average purely fossil fuel based car.
Is it more fuel efficient? Yes.
Is it any better for the environment? No.