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By this time next year, the Audi A3 Sportback will be offered with a variety fuel-efficient powertrains ranging from diesel to the all-electric E-Tron, but perhaps the most interesting is the all-new G-Tron model, which uses Audi's innovative carbon-natural compressed natural gas called e-gas. Previously called A3 TCNG, we first heard about this technology last year, but now Audi has confirmed that this low-emission, sustainable-fuel will debut by the end of this year on the A3 Sportback G-Tron.

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On December 13, Audi celebrated its synthetic methane (e-gas) vehicle fuel plant, which is under construction in Werlte, Germany. Audi says that it is the world's first industrial plant for generating e-gas from CO2 and renewable electricity. Its end product will be hydrogen and synthetic Audi e-gas, which will be used as climate-friendly fuel for vehicles such as the new Audi A3 Sportback TCNG. E-gas production will begin in the spring of 2013.

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A car can be considered CO2 neutral if the amount of greenhouse gas used in creating the fuel is balanced against the CO2 emitted by the vehicle in operation.

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Audi has revealed its 2013 A3 Sportback in Munich ahead of the model's official debut at the 2012 Paris Motor Show later this week, and Autoblog was on hand for the early unveiling. Like its three-door cousin, the third-generation five-door wears subtly evolved styling inside and out as well as a longer wheelbase, more interior room and a commendable weight savings of around 198 pounds over its predecessor. This particular model wears the line's optional LED headlamps and features a bi-fuel powe

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click above for high-res gallery of the new Ford FG Falcon

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