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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.

Audi spotted testing new S4 at the Nurburgring

Where there's smoke, there's fire. Only in this case, the smoke is the upcoming new Audi A4, and the fire is the S4 spotted undergoing testing in this latest batch of spy shots. Snapped in both sedan and Avant wagon forms while undergoing testing on and around the Nurburgring – where else? – the next-generation Audi S4 will of course be based on the new A4 that's anticipated to debut in Frankfurt this September. That means MLB Evo architecture and styling that takes a page out of the new TT's playbook. But in S4 trim, it'll be altogether more performance oriented. Expect an even more powerful version of the outgoing model's 3.0-liter supercharged V6, pumping out a good 340-350 horsepower to all four of its driven wheels. That power will help it keep pace with the new Mercedes C450 AMG Sport. It won't have to take on the new C63 AMG directly, though, as that'll be the job of the next RS4 that will slot above it. But since that model may never make it to US showrooms, this will stand as the flagship of the new A4 family as far as the American market is concerned. Related Video:

2016 Audi A6 to start at $46,200*, A7 begins at $68,300*

Audi has announced pricing on the new A6 sedan and A7 four-door coupe, with the former starting at $46,200 for a 2.0-liter, turbocharged four-cylinder and front-wheel drive. Of course, things can and do climb rapidly from there. Adding Quattro all-wheel drive to the four-cylinder model bumps the price up $2,200, while moving from the base Premium to the mid-level Premium Plus trim will add $3,700, regardless of the drivetrain. Speaking of that Premium trim, it's only available on the 2.0-liter A6. Every other variant starts with the Premium Plus. At that point, the cheapest six-cylinder you can get is the $57,400 model, while the diesel-powered A6 TDI starts at $59,500. Moving up to the top-end Prestige trim bolsters the price by $4,200, for both engines. If you fancy the sleeker lines of the A7, the entry-level 3.0-liter Premium Plus can be had for $68,300, while the TDI runs $70,400. While the starting price is higher than the A6, adding the Prestige trim is more reasonable, with both engines demanding $2,650 for the top-tier equipment level. And of course, we can't get away without mentioning Audi's high-performance models. A base S6 Premium Plus begins at $70,900, while the Prestige is $75,300. The S7 and RS7, both of which are limited to the Prestige trim level, start at $82,900 and $108,900, respectively. None of the above prices include the standard $925 destination charge. Scroll on down for the official press release on the pricing changes for the new Audi A6 and A7. Related Video: Audi announces pricing for the new 2016 A6 and A7 model lines April 17, 2015 | Herndon, Virginia Award-winning vehicles get more dynamic designs, improved technology and greater power and efficiency New 2.0 Liter TFSI engine – the most powerful engine in its class, with greater performance and efficiency Standard next generation of MMI® with Audi connect® and rapid 4G LTE connectivity Audi today announced pricing for the 2016 A6 and A7 model lines. With new engines and updated design, all Audi A6 and A7 models now offer more power, greater fuel efficiency and class-leading technology for two of the Audi brand's top-selling vehicles. The 2016 A6 and A7 sedans boast more athletic design as well as new headlights and driver assistance systems. New infotainment systems provide even higher levels of interior luxury and refinement.