Audi A3 Sportback g-tron is Powered by Compressed Natural Gas By Jason Siu Mar 01 2013 Share this Article Tweet Audi has released a preview for one of its 2013 Geneva Motor Show debuts, the A3 Sportback g-tron. Continue Reading... Filed under: Audi Auto Show News Family Sedans Featured Articles German Luxury Cars Sedans WagonsTags: 2013 geneva auto show, 2013 Geneva Motor Show, a3 g-tron, a3 sportback, a3 sportback g-tron, Audi, audi a3, audi a3 sportback, audi a3 sportback g-tron, geneva auto show, geneva motor show