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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.

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:

Mercedes-Benz EQC vs. Jaguar I-Pace vs. Tesla Model X: How they compare on paper

The Mercedes-Benz EQ line is officially alive and kicking, with the reveal of the EQC electric crossover. It joins a segment that, while still in its infancy, seems ready to take off. Mercedes lists as the EQC's competitors the Jaguar I-Pace, The Audi E-Tron Quattro and the BMW iX3. While we've seen all of these, at least in concept or pre-production form, only one — the Jag — has actually been launched in production form. We've seen a concept and subsequent spy shots of the iX3, and the Audi EV will get its official specs publicized later this month. One electric SUV Mercedes didn't specifically call out was the Tesla Model X. As such, we've decided to compare on paper the Mercedes-Benz EQC 400, the Jaguar I-Pace S and the Tesla Model X 75D: All three are dual-motor EVs, though the Tesla is the longest and tallest. The EQC has the most power, but it and the Model X's 4.9-second 0-60 times fall short of the I-Pace. It also has the lowest top speed and electric driving range. (Mercedes sent us an updated range figure, but it's using the generous and largely outdated NEDC cycle; we're still waiting on an EPA rating.) We'll be interested to see how much the Mercedes weighs. Mercedes hasn't divulged the price of the EQC yet, but we imagine it'll fall pretty near to the $70,000 mark. As for Audi, we'll revisit this comparison after those details are made available on September 17. If you're interested in some other EV comparisons, we have a couple others that we published to compare the I-Pace to premium Teslas, as well as against other less-expensive EVs. If you want to learn more about these EVs, and compare them with other cars, be sure to check out our Car Finder and comparison tools. Related Video: Featured Gallery Mercedes-Benz EQC 400 EV Crossover View 28 Photos Green Jaguar Mercedes-Benz Tesla Crossover SUV Electric Luxury Comparison jaguar i-pace mercedes-benz eqc