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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:

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

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