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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.

Mercedes dropping Shooting Brake from next CLS-Class

If you've been admiring the Mercedes CLS Shooting Brake from afar and held out hope that the next version might make it to over to our side of the pond, we've got bad news for you. Not only will the next rendition of Benz's sleek wagon not make it to North American showrooms, it won't be offered anywhere. According to Car, the German automaker has pulled the plug on the next CLS Shooting Brake. The five-door bodystyle was slated to form part of the third-generation CLS-Class lineup, whose design has already been finalized. But though there was reportedly great enthusiasm for the shooting brake within the company, lukewarm response from the vital North American and Chinese markets meant that plans for another wagon variant were scrapped altogether. Mercedes first rolled out the CLS four-door coupe in 2004, pioneering the popular new segment before BMW followed with its Gran Coupe models and Audi its Sportbacks. The second-generation model arrived in 2010, with a Shooting Brake following in 2012. Stuttgart even followed up with a smaller CLA Shooting Brake as well. With the third-generation model now on its way, however, the CLS is going back exclusively to four doors and a trunk. Of course that doesn't mean Mercedes won't be offering any oddball long-roofed models. It simply appears to be filling those niches with slant-backed versions of crossovers like the new GLC and GLE instead. So if you're looking for a vehicle with a Silver Star on the nose and an unconventional roofline at the back, you're going to have to settle on riding higher. Related Video:

Mercedes Concept IAA shows its mighty morphing aero aids

Modern supercars are utilizing more active aerodynamic elements that constantly adjust, to make them some of the fastest things on the road. The Mercedes-Benz Concept Intelligent Aerodynamic Automobile is using them too, but the know-how is applied here for ultimate efficiency rather than turning better lap times. In the standard design mode, the four-door luxury coupe looks like a CLS from the near future with styling that's mixed with a little of the F 015 concept. However at the press of a button or upon hitting about 50 miles per hour, the IAA transforms into aero mode to have an insanely low drag coefficent of just 0.19. To achieve the ultra-efficient shape, the rear of the concept stretches over 15 inches to guide air down the tail. Flaps in the bumpers also extend outward, and the wheels adjust to improve the flow around the sides. To trim things out underneath, a portion inside the front bumper moves, as well. Inside, passengers sit in organically shaped leather seats, but occupants have to look at a vast array of purple and blue LED accent lights. The big panoramic roof is a nice touch, though. It would be interesting to watch water tumble over this slippery shape when driving in the rain. To maximize efficiency, Mercedes powers the IAA with a plug-in hybrid that's hooked up to a gasoline engine. The result is 275 horsepower and an electronically limited top speed of 155 miles per hour. On the European testing cycle, the company figures the concept could cover 41 miles solely on electric power in aero mode. Showing the gains of the swoopy transformation, that figure falls to 38.5 miles in design mode.