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Why it's difficult to accurately test the efficiency of a plug-in car

When it comes to electric vehicles and plug-ins in general, the Environmental Protection Agency-certified range is a hugely important number. While actual range anxiety is largely psychological, the magic number does provide a point of comparison of buyers considering one EV over another. The driving distance is also often touted by automakers when marketing their models. Unfortunately, as Green Car Reports finds in a recent deep dive, the way the EPA calculates the figure is a convoluted mess, and discovering the reasons why is definitely worth the read. The issue isn't about bad science but instead comes down to vague wording. The EPA's accepted range test is sourced from an evaluation called J-1634 from the Society of Automotive Engineers, and it seems to provide balanced results for vehicles that automatically reach a single state of charge when plugged in. However for models with multiple charge settings, the situation gets complicated very quickly. Of course, these modes are often created in the software, meaning that a car's certified driving distance can change with just a few taps of the keyboard without the real world results owners might experience actually changing. By showing the test's effects on the certified range for the Tesla Model S, Nissan Leaf and Mercedes-Benz B-Class Electric Drive over the last few years, Green Car Reports makes a compelling argument that it's the evaluation that needs to change. Thankfully, it appears that the solution is a very simple one. Get the details here.

Weekly Recap: Ferrari looks to reclaim old success with new manager

Clearly, Ferrari doesn't race for fourth place, and this week, major changes continued at the Scuderia. It was a rough year for Ferrari, and the Scuderia conducted its season-ending tests in Abu Dhabi this week with a view toward a fresh start in 2015 with new leaders and a new ace driver. Though plenty of other Formula One teams were disappointed with their finishes in 2014, Ferrari was perhaps the most eager to put this season in its rear-view mirror. The Scuderia finished a distant fourth in the Constructors standings with 216 points, well behind No. 1 Mercedes (701 points), and Ferrari failed to win a single race as the Silver Arrows dominated the grid. It was an especially bitter pill for a team that claims 16 Constructors championships and 15 Drivers titles – the most in history – and is the only surviving team from F1's first season, 1950. Clearly, Ferrari doesn't race for fourth place, and this week, major changes continued at the Scuderia. Ferrari named Philip Morris executive Maurizio Arrivabene as team principal. He replaced Marco Mattiacci, who held the job for only seven months after taking over for Stefano Domenicali, who resigned in April amid the Scuderia's early-season struggles. Phillip Morris (through its Marlboro brand) is a key Ferrari sponsor, and that played a role in Arrivabene's ascension. Still, he's no stranger to F1, and has been intimately involved in the Ferrari-Marlboro partnership. He also has served as the sponsors' representative on the FIA's F1 Commission since 2010. In a statement, new Ferrari chairman Sergio Marchionne said: "We decided to appoint Maurizio Arrivabene because, at this historic moment in time for the Scuderia and for Formula One, we need a person with a thorough understanding not just of Ferrari, but also of the governance mechanisms and requirements of the sport." Arrivabene's background is primarily in marketing and communication, and most recently he held the title of vice president of consumer channel strategy and event marketing for Philip Morris. He has been with the company since 1997. Arrivabene now leads a team that's rife with change. Marchionne took over in October when longtime boss Luca di Montezemolo quit in a disagreement about Ferrari's future, and the company itself will be spun off from parent Fiat Chrysler Automobiles in 2015.

Xcar drives the Mercedes-AMG C63 S

The transition among Europe's high performance vehicles from naturally aspirated power towards turbocharging has taken time but has shown constant progress. The march seemingly started with hot hatches when models like the Volkswagen GTI quit adding displacement and finally succumbed to forced induction. Now, the change has affected the higher rungs with the latest BMW M3 and possibly even all future Porsche 911s. Of course, the question arises does this shift really matter to the driving experience? Xcar Films aims to find while taking a spirited ride in the new Mercedes-AMG C63 S. One thing is for sure; the switch from the 6.2-liter V8 in favor of the new 4.0-liter twin-turbo doesn't seem to be hurting the Merc's sound. Even with forced induction, the exhaust still emits a very angry grumble. Find out from Xcar if the rest of the new engine's attributes stack up quite so well, though. Related Video: