2006 Mercedes Slk350, 268hp V6, Retractable Hardtop, Neck Scarf 1 Owner on 2040-cars

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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.

2014 Mercedes-Benz B-Class ED has 87-mile range, 84 MPGe

Well, that extra weight had to be felt somewhere. With Mercedes-Benz getting ready to start US sales of its B-Class Electric drive this summer, the big question was how well its range would stack up against other electric vehicles sold in the States. Turns out, the Benz is a bit of a juice hog. Let's say up front that the 87-mile single-charge range of the Mercedes-Benz actually stacks up nicely against its competition, since that distance puts the new model right in line with the Nissan Leaf and BMW i3 (we'll ignore the Tesla Model S for a second, here). You can find the numbers at the US Department of Energy's FuelEconomy website. As far as miles per gallon equivalent ratings, though, the Benz's steel frame makes it come up short, as it's about 1,300 pounds heavier than the carbon-fiber-body i3 and about 600 pounds heavier than the Leaf. The B-Class EV has a bigger battery than the i3 or the Leaf (36 kWh compared to 22 kWh for the i3 and 24 kWh for the Leaf) and that's one reason the car gets an 84 MPGe rating, which is about 26 percent less than the Leaf's and 32 percent less than the i3's. But at least the local utility companies will be happy. Mercedes-Benz priced the 177-horsepower B-Class ED in April at $41,450, or $100 more than the i3. Check out Autoblog's First Drive impressions here.

Mercedes GLE Coupe spotted in almost undisguised AMG form

Say what you will regarding the form and function of the BMW X6, the bottom line is that BMW essentially pioneered a winning formula, sloping a roofline onto an existing model to make a new and highly lucrative) derivative. No wonder rival Mercedes-Benz is clamoring to follow suit with models like the one pictured here. Under development for some time now, the model originally slated to be called the MLC and now expected to be dubbed GLE Coupe looks about ready for its big debut. It's based on the replacement for the current M-Class (to be rechristened GLE) but with that vital sloping roofline to make it more rakish. This particular example seems to be an AMG version and was spied with only minimal camouflage around the front and rear bumpers while undergoing testing in snowy climes. That could be the full-on GLE63 AMG performance variant, or the new AMG Sport model destined to debut at the Detroit Auto Show next month. If it's the former, expect it to be packing the same 4.0-liter twin-turbo V8 as the new Mercedes-AMG GT, where it produces either 462 horsepower or 510 depending on spec - ready to take on the X6 M and whatever Audi is preparing to throw at it.