Cars and TransportationAudi A4 Avant g-tronTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoCars and Transportation06/20/2017June 20, 2017The A4 Avant g-tron is the latest in Audi's family of natural gas hybrid cars. The vehicle primarily runs on natural gas but can switch over to gasoline. https://p.dw.com/p/2ewfEAdvertisement