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Vision Mercedes-Maybach 6 Cabriolet is last year's concept with a soft top

Last year, Mercedes brought an absurd, excessive two-seat coupe to Pebble Beach called the Vision Mercedes-Maybach 6. We say absurd and excessive because it was a roughly 19-foot long coupe for just two people. It also packed a 750-horsepower electric powertrain. This year, Mercedes brought pretty much the same car, but now with a soft top and the suffix "Cabriolet." Because the Vision Mercedes-Maybach 6 Cabriolet is basically the same car as the coupe, it's also dripping with unashamed excess. It's still 19 feet long, it still carries only two people, and it still has 750 horsepower from electric motors. Mercedes claims that power will propel the car to 60 mph in under 4 seconds. Also like the coupe, it has a range of 200 miles on a charge, and with the right charger, can supposedly regain about 60 miles in 5 minutes. There are changes to the car, though. For one, it's painted a different color. Instead of the vibrant red of the coupe, the roadster is a navy blue that Mercedes says helps evoke the feeling of a yacht — more so than the size already did. It also has new wheels with a more conventional multi-spoke look. They're also have rose gold-painted accents. The change to a convertible body style alters the appearance of the Mercedes-Maybach 6 more than you'd expect, too. Now that a significant portion of the vehicle is finished in a contrasting color, the car looks a bit shorter, in a good way. It doesn't look cumbersome. The lack of a fastback also helps keep the tail from looking like it's sagging, as it does on the coupe. The interior of the Vision Mercedes-Maybach 6 Cabriolet is mostly the same as the coupe, too. It features the same white leather seats that blend into the doors and dashboard. It also has the wild wraparound display and clear center tunnel with light tubes that show the flow of electricity to the motors. Metal highlights are finished in rose gold hue, as is the stitching. The differences include more prominent shapes that imply air vents, as well as a wood floor with aluminum strips to complete the yacht feeling. Also, the buttons that dot the seats have Mercedes logos on them, and they're backlit. We also get a peak under the hood of the Mercedes-Maybach 6 Cabriolet. It opens up like pre-war cars with two panels connected by a center hinge. Because it uses compact electric motors and underfloor batteries, there's storage space under the hood.

Mercedes-Benz engines with 48-volt systems coming in 2017

As part of a big green push announced yesterday, Mercedes-Benz is jumping into the world of 48-volt power. The company will launch a new family of efficient gasoline engines next year and will begin rolling out 48-volt systems with it, likely in its more expensive cars first. Mercedes will use the 48-volt systems to power mild-hybrid functions like energy recuperation (commonly called brake regeneration), engine stop-start, electric boost, and even moving a car from a stop on electric power alone. These features will be enabled through either an integrated starter-generator (Mercedes abbreviates it ISG) or a belt-driven generator (RSG). (RSG is from the German word for belt-driven generator, Riemenstartergeneratoren. That's your language lesson for the day.) Mercedes didn't offer many other details on the new family of engines. There are 48-volt systems already in production; Audi's three-compressor SQ7 engine uses an electric supercharger run by a 48-volt system, and there's a new SQ5 diesel on the horizon that will use a similar setup with the medium-voltage system. Electric superchargers require a lot of juice, which can be fed by either a supercapacitor or batteries in a 48-volt system. Why 48-volt Matters: Current hybrid and battery-electric vehicles make use of very high voltages in their batteries, motors, and the wiring that connects them, usually around 200 to 600 volts. The high voltage gives them enough power to move a big vehicle, but it also creates safety issues. The way to mitigate those safety issues is with added equipment, and that increases both cost and weight. You can see where this is going. By switching to a 48-volt system, the high-voltage issues go away and the electrical architecture benefits from four times the voltage of a normal vehicle system and uses the same current, providing four times the power. The electrical architecture will cost more than a 12-volt system but less than the complex and more dangerous systems in current electrified vehicles. The added cost makes sense now because automakers are running out of ways to wisely spend money for efficiency gains. Cars can retain a cheaper 12-volt battery for lower-power accessories and run the high-draw systems on the 48-volt circuit. The industry is moving toward 48-volt power, with the SAE working on a standard for the systems and Delphi claiming a 10-percent increase in fuel economy for cars that make the switch.

Mercedes working on new inline-six engines

Mercedes-Benz will make a return to the inline-six-cylinder engine game, according to a report from the UK's AutoCar. It's not clear what's prompting the phasing out of the current array of V6s.
We'll see the first inline-six from Mercedes in next-generation E-Class, set to debut in 2016. Following that, it'll arrive as part of a mid-cycle refresh for the C-Class in 2017. What's particularly special about the new inline-six is its modular nature, which will allow Mercedes to eventually spinoff three- and four-cylinder options, with the three-pot arriving alongside the new inline-six.
In other news, AutoCar uncovered some details on the next C-Class AMG, which will ditch its excellent 6.2-liter, AMG V8 in favor of a 4.0-liter, twin-turbocharged V8, although we've already told you about that. What we didn't know at the time, though, was that the 4.0-liter would be paired first with a new, seven-speed AMG Speedshift transmission and offer all-wheel drive. AC also reports that a nine-speed Speedshift is in the works.