2012 Audi S5 Cabriolet Convertible 2-door 3.0l on 2040-cars

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Audi RS7 vs. Porsche Panamera Turbo, which would you pick? [w/poll]

We live in a blessed time - a time when you can buy not just one, but two (or three, or four) monstrously powerful, blazingly fast four-doors that can't only keep up with modern supercars, but in some instances, will outperform them as well. Two of the finest are the Audi RS7 and the refreshed Porsche Panamera Turbo, and Motor Trend has been messing around with the both of them in this comparison video.
MT provides a comprehensive and entertaining look at the RS7 and the turbocharged Panamera as they go through a battery of tests, before getting tossed about on both the road and the track. Starring flip-flop aficionado Jonny Lieberman, it's a must-watch, whether you're in the market for one of the two super sedans or merely want to see the former Autoblog editor again.
After having a look at the video, register a vote for the car you'd park in your driveway in our poll. Hop below for the full video from the team at Motor Trend.

Audi creates new diesel fuel from carbon dioxide and water

What if you could power cars of the future with pollution created by the cars of the past? That's what German automaker Audi is hoping to achieve by creating a new synthetic fuel using renewable energy to turn water and carbon dioxide gas into a new kind of fuel they call "e-diesel." The new diesel is being produced at Audi's pilot plant Sunfire in Dresden, Germany. Only a few gallons were created, which the German Federal Minister of Education and Research Johanna Wanka put into her Audi A8 to prove the fuel's bonafides. The base fuel is known as "blue crude" and begins from a green source. Audi uses electricity from wind, water or solar power sources to separate hydrogen from oxygen in water. The hydrogen is then mixed with carbon dioxide which has been converted in carbon oxide. The blue crude is then further refined to create the e-diesel. The carbon dioxide is currently supplied by a biogas facilities, but some of that CO2 was captured from the air. "The engine runs quieter and fewer pollutants are being created," says Sunfire CTO Christian von Olshausen. The fuel can be combined with conventional diesel fuel, as biodiesel fuels already and would be competitively priced against regular diesel, according to Gizmag. Sunfire can produce about 42 gallons of e-diesel a day. That seems like barely a drop in the bucket in terms of Europe's energy use, but Audi is ready to commercialize the technology with plans to expand production with a bigger facility in the future.

2016 Audi A4 is larger, lighter [w/video]

The 2016 Audi A4 arrives with a bang, but no surprises. We say that because the formula for creating the new A4 is one we know all too well. Make it larger, add a bunch of content, reduce weight, and improve both power and efficiency. It's a recipe for success, and this fifth-generation A4 looks to be a solid contender against its chief rivals, the BMW 3 Series and Mercedes-Benz C-Class. The shape hasn't changed; it's immediately recognizable as an A4. Instead, this new model updates that familiar design with sharper lines, similar to what we've seen on the new Q7, or even the R8. The big story here is that the 2016 A4 is up to 264 pounds lighter than its predecessor, depending on trim and engine. Additionally, the A4 is the most aerodynamic car in its class, boasting a drag coefficient of just 0.23. A fresh, modern cabin lies within that lighter shell – one that looks decidedly more upscale than the last A4. Many elements are reminiscent of the Audi Prologue concept that we first saw (and drove) in Los Angeles last year – specifically, the steering wheel, and the new MMI controls. In fact, Audi has positioned its infotainment controls closer to the center console – in front of the gear selector. This reminds us of the current A8, where Audi specifically designed its shifter to act as a sort of wrist rest. You can rest your arm on the gear lever and still access all of the MMI functionality. Speaking of which, that's the latest generation of Audi's MMI interface, packing navigation, touch capability, LTE connectivity, and WiFi in the 8.3-inch color display. Audi isn't saying which engines will come to the United States right now, but when the new A4 launches, it'll be offered with three gasoline and four diesel engines in Europe. Our best guess is that the US-spec car will come with the latest 2.0-liter TSFI turbocharged inline-four with 272 horsepower, as well as Audi's tried-and-true 2.0-liter TDI diesel four. Front- and all-wheel drive will be available, and for the first time, two-wheel-drive models will get a proper dual-clutch transmission – no more CVT. There's a whole lot more to lean about the A4 in the press release, posted after the reveal video. You can also see the 2016 A4 in sedan and Avant forms in the galleries above and below – it's unclear if the wagon will make its way to the US. The A4 Avant has been sold here before, but currently, Audi only offers that more functional bodystyle in Allroad spec.