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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.

2015 Mercedes-Benz S63 AMG Coupe

Conventional wisdom would dictate that adding more power and several key performance enhancements to an already very good car, like the 2015 Mercedes-Benz S550 Coupe, will end up equaling an even better car. In the case of the 2015 Mercedes-Benz S63 AMG Coupe, conventional wisdom sort of applies, but perhaps not as much as we'd have initially guessed. We'll get into the nitty gritty details in just a moment, but here's the most immediate takeaway we had in our minds as we walked away from this super coupe: The S63 AMG is excellent, but so is the slightly more mundane S550 Coupe on which it is based, and which is priced some $41,000 less expensive than its more powerful sibling. Chew on those figures while we examine what differentiates the two S-Class Coupes. Drive Notes As expected, the single greatest highlight of the 2015 S63 Coupe is its engine. As a powerplant, it's a gem. As a hand-built engineering exercise, its 577 horsepower and 664 pound-feet of torque are just as impressive in real life as they sound when recited from stat sheets. Not that the old CL63 AMG was lacking in power, but the new S63 AMG Coupe boasts 41 more horses and 74 more lb-ft than the outgoing engine. The run to 60 miles per hour takes a scant 3.9 seconds, according to M-B, aided in no small part by the car's 4Matic all-wheel-drive system and other assorted electronic brains deciding where, exactly, all those ponies should be sent. The rear-biased system is tuned to send two-thirds of the engine's power to the rear wheels in a bid to make the car feel more like what performance-minded drivers expect. Top speed is electronically limited to 186 miles per hour, which is plenty fast enough, even in the days of 200-plus-mph sedans from M-B's former corporate cousin Dodge. We didn't get anywhere near the car's maximum velocity, but our brief trips into triple-digit territory were quiet, comfortable and completely free of drama. The seven-speed automatic gearbox responds quickly to requests of your right foot, but the steering wheel-mounted paddles don't change gears as quickly as we'd like when in Manual mode. Controlled Efficiency (which we'd call Comfort) maximizes efficiency, keeping the transmission in higher gears and shifting earlier than when in Sport mode, and we didn't find much fault with the computer's shifting algorithms in either setting.

Mercedes-Maybach previews longer, more lavish S-Class ahead of debut

In some international markets, Mercedes-Benz's new 2021 S-Class will get Level 3 semi-autonomous technology, but chauffeur-driven buyers already enjoy full autonomy. It's for these individuals that Mercedes-Maybach, the firm's extra-luxury division, stretched the sedan's wheelbase and gave it an interior worthy of a private jet. Maybach said it developed its variant of the 2021 S-Class specifically for buyers with a chauffeur. It added seven inches to the sedan's wheelbase, and the additional sheet metal benefits those riding in the back. Standard executive rear seats give passengers a comfortable place to work or rest while they're being driven, and the list of new features added to the sedan include massaging calf rests as well as heating for the neck and shoulders. Although we haven't seen Maybach's S-Class yet, a preview image shows the optional two-tone paint — one of the company's hallmarks — and a chromed Maybach emblem. Up front, it will receive a specific grille with vertical slats instead of the horizontal ones worn by the standard S-Class. An additional serving of chrome-look trim will almost certainly further set the Maybach apart, but it will retain its predecessor's relatively subtle design. Specifications won't be announced until the model's unveiling. Mercedes-Benz confirmed it's phasing out V12s, though the big engine could return for one final round under the hood of the S-Class. Alternatively, Maybach may have chosen to surf the downsizing wave still sweeping across the industry by selecting a 4.0-liter V8. Mercedes-Maybach will introduce the 2021 S-Class online on November 19 at 2 p.m. Stuttgart time, which is 8 a.m. in New York City and 5 a.m. in Los Angeles. Deliveries are scheduled to start during the first half of 2021. When it lands, the sedan will join Maybach's variant of the GLS in showrooms across the United States. Related Video: