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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.

Mercedes testing C-Class plug-in hybrid modes in Germany

Testing appears to be underway for what would be the first Mercedes-Benz C-Class with a hybrid powertrain. We can see a pair of the prototypes undergoing testing in Germany, with one, a C-Class Wagon, still heavily clad in camouflage and featuring a more noticeable outlet on the passenger side of its rear bumper.
There's also a more production-looking sedan, which features a not-so-discreet flap over its rear-bumper outlet. It's difficult to speculate on power outputs for this fuel-sipping C-Class, although our spies seem to think that this car will feature some combination of a four-cylinder gas engine with an electric motor, although just which four is unclear (note, we wouldn't mind if MB fit its 2.0-liter turbo with some batteries and motors). Regardless, the four-pot/electric motor seems like a pretty reasonable combo, although it probably means that Mercedes won't be challenging the six-cylinder-powered system of the BMW ActiveHybrid3 any time soon.
When the plug-in C-Class arrives later this year as a 2015 model, it will likely offer a full range of driving modes, including both gas or electric, only, as well as a more traditional hybrid mode.

Mercedes goes boating again with G63 AMG-inspired Cigarette

Cigarette Racing has another Mercedes-Benz AMG-themed boat headed out to sea. After The SLS AMG-inspired 46-foot Rough Rider in 2010 and the C63 AMG Black Series-inspired 50-foot Marauder in 2012, this year's Miami Boat Show will introduce the 42-foot Huntress, theme provided by the G63 AMG.
The latest Cigarette homage is less overly racy than the ones before, befitting a watercraft modeled off a performance SUV, but don't let the looks fool: there are five Mercury Racing Verado 350SCi outboard engines, each one of them packing a supercharged inline six-cylinder with, natch, 350 horsepower. Those 1,750 horses will be good for 78 miles per hour when you've got some saltwater underneath you.
If you're in South Florida this week, Booth B-23 at the Miami Convention Center could be your best place to see it. Otherwise, like the 536-hp G63 AMG, it could be hard to catch. There's a press release with more information below.