2012 Audi Q7 on 2040-cars

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Adam Carolla is world's the least helpful test drive co-pilot

If you were going to test drive a new car, who would you want to take with you? Your spouse? A friend? Maybe an automotive journalist? Well take it from us: there's one of us riding shotgun just about every time we go to drive anything, and we're not all we're cracked up to be.
How about a celebrity comedian? Well, that largely depends on which comedian we're talking about here. Some - say, Jerry Seinfeld or Jay Leno, for example - might be more helpful than others, being more or less schooled in the finer points of the modern automobile. Adam Carolla might seem like he belongs on that list too, but in this latest video for a friends at Edmunds.com, the one-time host of The Car Show on Speed TV seems bent on being as comedically intrusive as possible. Which may be funny, but helpful? Not so much. See what we mean in the video below, and the next time you go to test drive a new car, you just might find the world's most popular podcast host climbing in with you.

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.

Watch this Audi RS6 go 208 mph... on ice

In and effort to promote the high-speed grip of its new Hakkapeliitta 8 winter tire, Nokian threw a set of its new rubber on a race-prepped Audi RS6 and got moving - very, very quickly. In fact, on March 9 on top of the very frozen Gulf of Bothinia near Oulu, Finland, Nokian's test driver Janne Laitinen set a new world record for the fastest speed recorded driving on ice. If you'll recall, this isn't the first time that Audi and Nokian have played this game, either.
Using the guidelines set forth by the Guinness Book of World Records for such things, Laitinen averaged 208.602 miles per hour (335.713 kilometers per hour) over the course of two runs on natural, untreated ice. Another constraint is that the ice speed record must be done using commercial available tires, which is obviously great PR for the new Hakkapeliitas. The press release doesn't make any mention of how the RS6 was prepared to reach such high velocities, but the images of the car make it clear that this is no stock machine. Scroll on below to see the impressive video evidence of the Audi's record run.