2012 A6 3.0t Prestige: 4,700 Mi, Driver Assistance, 20" Sport, Cold Weather, Led on 2040-cars

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Recharge Wrap-up: Ferrock a carbon-negative cement substitute, Audi makes e-diesel

A cement alternative uses recycled materials and traps CO2 rather than producing it. Invented by David Stone at the University of Arizona, Ferrock uses recycled steel dust and glass to produce a substance stronger than conventional concrete. Cement has a high carbon footprint from the high heat needed to process the limestone. Ferrock needs no such heat, and it actually uses CO2 to harden, making it, as Stone calls it, a carbon-negative material. Learn more in the video above, see the transcript at PBS NewsHour and read more at Green Car Reports. Teslarati offers a detailed rundown of Tesla's new Valet Mode feature for the Model S. Part of the Firmware 6.2 update, Valet Mode allows the owner to disable certain performance features and block personal information when letting someone else drive the car. It limits the car's to speed to 70 miles per hour, and caps output at 80 kW. It can also disable mobile app access, Homelink, Bluetooth and wifi and the "Places" function, which stores addresses for you. The folks at Teslarati did find some shortcomings in the new feature, though. Read more at Teslarati. Audi has produced its first batch of e-diesel made from water and CO2. The fuel is made by reacting hydrogen from the water with CO2 to make long-chain hydrocarbon compounds called "blue crude." That can then be refined similarly to crude oil to make e-diesel, which is a fuel free from sulfur and aromatic hydrocarbons. That e-diesel can be used on its own, or mixed with fossil fuel diesel to power a vehicle. "In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long-distance mobility with virtually no impact on the climate," says Audi Head of Sustainable Product Development Reiner Mangold. Read more in the press release below. Fuel of the future: Research facility in Dresden produces first batch of Audi e-diesel - The verdict: Pilot plant produces high-quality diesel fuel - No need for mineral oil: e-diesel made from water, CO2 and green power - Minister Wanka: "Synthetic diesel using CO2 is a huge success" Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel. After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high-quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof.

Get lost in Evo's sublime 2013 Car of the Year testing

Every year Evo stages its Car of the Year test, bringing the best performance cars in the world to one location for an epic shootout. This year the magazine pitted eight CotY finalists against each other on Route Napoleon in Southern France - Evo claims it's the "best road in the world" - and then proceeded to nitpick the smallest of faults on each car until the winner could be named. You see, this year's lineup of machines was just so good that only one car obviously wasn't CotY material from the get-go. Can you guess which one judging from the list below?
- Aston Martin V12 Vantage S
- Audi R8 V10 Plus

Audi reveals revised RS5 DTM for 2014

There existed an era in German touring car racing between when the DTM series was revived in 2000 and when BMW rejoined in 2012. During that twelve-season span, the wins were pretty evenly divided between Audi and Mercedes-Benz, the only two manufacturers who took part. Audi won six drivers' titles in that time and Mercedes won six (although Benz won considerably more constructors' titles).
Now that BMW is back in the race, though, it's an entirely different game. BMW has won the lion's share of the races in the past two seasons, taking both titles in 2012 and the constructors' title last season. The winning driver last season, though, was driving the RS5, making Audi the only one that really stands a chance of putting up a fight against BMW. It undoubtedly hopes to extend that challenge in the coming season, and this is the car with which it aims to do so.
Taking on the Mercedes-AMG C-Class Coupe DTM and the new BMW M4 DTM will be the revised RS5 DTM you see here. Bearing a stronger resemblance to the road-going RS5 you can buy, Audi's new DTM challenger benefits from a revised aero package with more streamlined side mirrors, closed rear wheel arches and reprofiled side sills. The V8 engine carries over (much as it did from the previous A4 DTM and A5 DTM) with 456 horsepower driving the rear wheels through a six-speed sequential gearbox.