Director: Peter SmithWith the creation of the Panamera S Hybrid; Porsche wanted to get rid of the Panamera's image as a giant gas guzzler. And it's indeed a fuel-saving miracle in its class. The sports car comes with an output of 380 HP and an average fuel consumption of just 6.8 liter. But the Porsche Panamera S Hybrid is not the only eco-friendly car. The Audi A3 g-tron is a natural gas car; that's CO2-neutral.