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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 caught testing stretched E-Class Maybach

The Mercedes-Maybach S600 won't be the only vehicle to wear the hyphenated name of two of the world's automotive luxury greats. That hulking S-Class will soon be joined by an E-Class variant, which should offer the same touch of subtle luxury as its big brother. At least, that's what we're guessing based on the latest round of spy photos, showing a stretched E-Class with some very telling camouflage. Pay attention, as our spies did, to the rear doors and C-pillar. Like the Maybach S600, the E-Class model features a larger quarter window, although unlike the S, the doors here look to be a bit larger than your usual E550 or E250. Also take note of the heavy tint on those rear windows. It's likely there to obscure whatever sumptuous hides and warm woods Maybach has fitted to the typically business-class interior. While the interior materials are likely to see sweeping changes, expect Mercedes to treat the exterior with a much gentler touch. There'll probably be some unique wheels and C-pillar-mounted Maybach badges, like what we've already seen on the S600. Check out the full round of spy photos up top, and stay tuned for more on the latest Mercedes-Maybach. Related Video:

2016 Mercedes-Benz C450 AMG Sport is not too hot, not too cold

Mercedes-Benz is moving to a new system for performance models, launching its AMG Sport line that will slot above the standard cars, but below the full-fledged Mercedes-AMG offerings. The perfect example of how this all looks can be seen with the C-Class – we've already driven (and enjoyed) the standard C300 and C400 offerings, and we're absolutely geeked to test the Mercedes-AMG C63. Slotting in the middle, though, is this new C450 AMG Sport, which makes its debut at the Detroit Auto Show this week. Power comes from the twin-turbocharged 3.0-liter V6 found in the C400, but output is increased to 362 horsepower and 384 pound-feet of torque – up from 329 and 354, respectively. That's all shuffled through the company's 7G-Tronic seven-speed automatic transmission, and sent to the road via 4Matic all-wheel drive. Hitting 60 miles per hour is said to take just 4.9 seconds, en route to a 155-mph top end. There's an AMG adaptive sport suspension with adjustable dampers (from the C63), and the interior and exterior aesthetics have been pumped up for a more sporting appearance. It all seems like a good fit, and we think it'll slot nicely in the middle of the already good C-Class range. Check out our fresh batch of lives images of the C450 above. Featured Gallery 2016 Mercedes-Benz C450 AMG Sport: Detroit 2015 View 12 Photos Related Gallery 2016 Mercedes-Benz C450 AMG 4Matic Image Credit: Live photos copyright 2015 Drew Phillips / AOL Detroit Auto Show Mercedes-Benz Luxury Performance Sedan 2015 Detroit Auto Show mercedes c450 amg sport