2010 Audi A4 Sedan Quattro Prestige 2.0t All Wheel Drive Automatic 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.

Audi tops Consumer Reports' brand rankings while Tesla leads domestics at eighth

Tesla supplanted General Motors' Buick division as the top-ranked US automaker in Consumer Reports annual brand rankings, though the electric-vehicle maker finished eighth among global automakers. Buick had finished atop CR's domestic car-brand list for three years before Tesla leapfrogged it. Scores were calculated from a combination of performance, owner satisfaction, and reliability. CR noted that Buick scored big on reliability but not so high on performance, while Tesla appeared to present the opposite case. Volkswagen's Audi division repeated as the best overall brand for the second straight year, beating out VW's Porsche unit, BMW, Toyota's Lexus division, and Subaru. Kia and Mazda followed those brands, while Honda finished ninth, between Tesla and Buick. Consumer Reports took results from 31 brands. Reliability issues related to the Toyota Tacoma helped drop that Japanese automaker out of the top 10. Take a look at CR's results for its Annual Brand Report Card here. That Tesla, Audi, and Porsche placed so high is topical, given some of the issues plaguing those automakers. Audi, Porsche, and their parent VW have been coping with the effects of the diesel-emissions scandal that broke back in 2015. The scandal has cost Europe's largest automaker billions of dollars, and forced VW to put a stop-sale on diesel-powered cars in the US in late 2015. And while the Tesla Model S improved from the "worse-than-average" label CR gave it in its 2015 Annual Auto Reliability Survey, the problematic falcon-wing doors on the Tesla Model X SUV pulled that model's reliability scores lower last year. Additionally, the Model X's climate-control system and door locks have also caused issues. Toyota and Lexus finished atop CR's reliability rankings last year. Related Video:

Hyundai tops VW and Buick in China, survey says

You may be aware of the long-time competition in China between Volkswagen and Buick, but another brand apparently should be in that conversation too: Hyundai. In a recently published annual consumer survey, the Korean company actually took the top spot to beat out its German and American rivals in second and third, respectively. The results were part of the China Brand Power Index that interviewed 11,500 people around the nation and was paid for by the country's Ministry of Industry and Information Technology. While Hyundai proved popular with voters, its sales haven't necessarily shown that yet. According to Bloomberg, the brand had falling numbers in China for the first quarter of the year. Even Ford outsold the South Korean automaker in the same period, despite scoring lower on the survey. Meanwhile, Audi ranked as the populace's favorite luxury brand, which is hardly a surprise given the Four Rings' strong sales in China. In January alone the automaker saw a 15-percent boost in volume there. Parent company VW's strong performance was somewhat more surprising, though. State media severely criticized the German automaker in March, and customers protested last year for the allegedly poor handling of a recall.