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US-bound Audi A3 Sedan spied testing

As the Audi A3 sedan gets closer to its debut, Audi has camouflaged prototypes to take it on the streets for final testing. Last time we saw the A3, it was testing almost in the buff, but it was on a closed track so our spy shooters were kept at quite a distance.
Now that the newest Audi sedan is testing on public roads, our latest batch of spy shots gives us a more detailed look at the entry-level luxury player despite the swirly camo. Except for the oversized wheels and the fancy exhaust outlets and door mirrors, the production version of the car should look almost identical to the A3 sedan concept we saw in Geneva a couple years ago. Some of the details we can see include a good-sized panoramic roof that stretches almost halfway into the rear passenger space and signature Audi LED-accented headlights and taillights.

Audi unveils A3 Sportback G-Tron with bi-fuel power, 808-mile range

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.
To create this e-gas, a plant in Werlte, Germany uses electricity to split water into hydrogen and oxygen. As hydrogen fuel cell vehicles become more popular, Audi says that this process could also be used to produce hydrogen fuel, but to create CNG, it mixes the hydrogen with carbon dioxide to create "synthetic methane." Since it is identical to the CNG available today, Audi's e-gas can be shipped and stored using the existing CNG infrastructure. Making the whole process even greener, Audi obtains the CO2 for this process from a nearby biogas plant, which would otherwise be released into the atmosphere.
Differentiated from the regular versions of the A3, the G-Tron features a pair of tanks under the rear cargo floor holding 15.43 pounds of CNG, which can power the car for almost 250 miles. What's more, the A3's conventional gasoline tank is still in place, giving the car an addition 560 miles of range. In total, that means the A3 G-Tron has a driving range of more than 800 miles. To run on both CNG and gas, Audi made changes to the car's 1.4-liter four-cylinder engine (including the turbo, cylinder head and fuel injection system) and catalytic converter.

Audi TT Sportback Concept evolves the five-door breed

One week after a leaked sketch ran on these very pages, Audi has introduced the latest member of a "potential TT family," according to Audi board member Dr. Ulrich Hackenberg. This is the TT Sportback Concept, a five-door, 400-horsepower version of the brand's stylish sports car and at this point, it looks darn likely to herald the debut of a third body style for Audi's design icon.
Unveiled at the expansive Volkswagen group night celebration ahead of the 2014 Paris Motor Show, the TT Sportback Concept is the most evolved version of a form factor that's seen a slow striptease throughout 2014, first with the Allroad Shooting Brake Concept in Detroit and, more recently, in the Offroad Concept from the Beijing Motor Show.
For Paris, the car being shown by Audi is absent traditional concept car traits like oversized wheels, miniscule mirrors and bizarre interior treatments, giving it a far more production ready appearance than either of the previous TT-based concepts. The exterior, meanwhile, is clearly reminiscent of the third-generation car (that roofline is pure TT), although there are a number of styling decisions that remind us of the compact A3, particularly in regards to the taillights.