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Mercedes previews new S-Class convertible

Mercedes keeps on expanding its flagship S-Class with more models, and will soon add one more to the roster. But before it does, it's giving us this teaser of what's to come with an advanced look at the upcoming new S-Class Cabriolet. The convertible model will be based closely on the S-Class Coupe we already know, only with a folding roof. Expect that dropping top to be constructed of several layers of fabric (as opposed to a folding metal top) with a glass rear window (instead of plastic) to keep it luxuriously isolated and insulated from the outside world when it's up, and let the wind and sunshine in when down. The Cabrio will bring the array of body-styles in the S-Class range up to six, with the convertible joining the existing coupe and four wheelbase lengths of sedan. Expect powertrain options to closely mirror those of the coupe, including S550, S63, and eventual S65 AMG models driving the rear wheels or all four. Slotting in above the E-Class Cabriolet, the new convertible S-Class will be Daimler's "first luxury four seater cabriolet since 1971." It'll compete in rather rare company against the likes of the Bentley Continental GTC, Aston Martin DB9 Volante, Maserati GranTurismo Convertible, and even the upcoming new Rolls-Royce Dawn when it arrives. And judging from the timing of this preview rendering's release, we anticipate it'll arrive soon. Related Video:

These are the 'Greenest' and 'Meanest' cars in 2015

As has become tradition, the American Council for an Energy-Efficient Economy (ACEEE) has come up with a ranking of what it refers to as the "greenest" cars of 2015, and, by way of contrast, a list of the so-called "meanest" cars, so those who value eco-friendliness over all else can choose which vehicles they should or should not consider buying. As you may expect, electric cars make up the majority of the greenest cars on the list, but, perhaps surprisingly to many, the Tesla Model S didn't make the cut. It's worth noting, too, that where the electricity an owner uses to charge their electric vehicle has a big impact on its overall environmental impact. "A car that is charged using electricity generated from natural gas or renewables is going to have significantly less impact on the environment than one charged on a coal-heavy grid," says ACEEE lead vehicle analyst Shruti Vaidyanathan. The ACEEE's list for 2015 looks very different than it did in 2014. It's an interesting collection, though – and we're sure this goes without saying, really – we'd recommend doing a bit more research into each vehicle and how it might fit into your daily life before making any purchase decisions. Click here to see the ACEEE's list of the Greenest and Meanest vehicles sold in the United States in 2015. Green Bugatti Chevrolet Fiat GM GMC Mercedes-Benz Nissan RAM smart Toyota greenest greenest cars

Singer Porsche, Koenigsegg, NSX: Leno's life doesn't suck

Jay Leno had quite a productive trip this year during Monterey Car Week. Not only did he get to pal around with Ian Callum and check out the Pebble Beach Concours d'Elegance, but the denim-clad comedian also headed to The Quail to talk to some prominent figures in the modern sports car scene. Capping off the fun, he got to take a drive in a Mercedes-AMG GT S, too Perhaps the highlight of this show is a nearly 10-minute interview with Christian von Koenigsegg. The founder of the Swedish hypercar company digs deep into the Agera One:1's engineering details, relating interesting facts about the aerodynamics and transmission. In addition, Leno chats with Rob Dickenson of Singer about its newly reimagined Porsche 911 Targa, and he gets the latest scoop on the Acura NSX's progress from newly promoted Acura Vice President and General Manager Jon Ikeda. If you like hearing about the nuts and bolts of sports car development, then this video can't be missed. Of course, we were there at Monterey, too, and we pointed our own cameras at some of the amazing machinery, both vintage and modern, at all the various car-focused events of the week. Take a look back at some of our own cool footage in the videos below. Related Video: