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Mercedes-Benz Concept IAA is a modern silver aero

While we English-speaking folk call it the Frankfurt Motor Show, our German friends call this week's bi-annual confab the Internationale Automobil-Ausstellung, or IAA. At first glance, then, you might think Mercedes-Benz named its Frankfurt concept, the Concept IAA, after the show it'd debut at. But, the Concept IAA isn't named for the show. It's actually an abbreviation for Intelligent Aerodynamic Automobile, and it's very aerodynamic indeed. This four-door coupe can transform, while moving, from its sedan-like design mode to an ultra-sleek, gas-powered fish of a car. This aerodynamic mode has a drag coefficent of just 0.19. That's sleeker than a Tesla Model S, and it ties the rating of the General Motors EV1 electric car. In fact, it's very nearly as aerodynamic as the Volkswagen XL1. The IAA can transform automatically at 80 kilometers per hour (about 50 miles per hour) or via the press of a button. When it enters an aerodynamic mode, eight segments at the back of the car extend out, adding over 15 inches to the overall vehicle length, effectively extending its already tear-dropped-shaped tail. And that's just the most visible aero aid. At the front of the car, flaps in the bumper extend out nearly an inch, while there's a smaller extender in the back bumper. These serve to keep air away from the wheel arches, where turbulence can become an issue. Of course, Mercedes has thought of this, too, fitting "Active Rims" that "alter their cupping from 55 mm to zero," whatever that means. There's even an active aero aid inside the front bumper, where a louver extends backward by 2.3 inches to smooth out the air traveling underneath the car. Outside of its super-slippery mode, the IAA is a relatively handsome four-door coupe, featuring the kind of plunging roofline that wouldn't look out of place on the company's pioneering CLS-Class. The interior is certainly worthy of the CLS, too. It's home to gorgeous white leather and touch-based controls, and in general, looks very luxurious. Mercedes' dogged pursuit of aerodynamics does not mean that the Concept IAA is some gutless ecomobile. Under the skin is a gas-powered, plug-in hybrid system that produces up to 279 horsepower and allows the sleek sedan to hit 155 mph. Its all-electric range is based, of course, on what mode its body is in. It's most impressive in aero mode, where it will cover 41 miles on a single charge. Switch over to design mode, and that figure drops slightly to 38.5 miles.

Mercedes-AMG to phase out 5.5-liter V8 after next year [UPDATE]

UPDATE: A previous version of this story indicated that AMG's 6.0-liter twin-turbo V12 was still mated to a five-speed automatic transmission, however the latest models (including the S65 AMG sedan and coupe, SL65 roadster and G65 sport-ute are equipped with the newer seven-speed unit. Mercedes also reached out to point out that the 5.5-liter engine will be phased out gradually, not overnight. There's a lot to love about AMG's 5.5-liter twin-turbo V8. It produces as much as 577 horsepower and 590 pound-feet of torque, and delivers blistering performance to even the heaviest of vehicles. But try not to get too attached, because like its 6.2-liter, naturally aspirated predecessor, it's not long for this world. The latest word comes from Autocar, which reports that Mercedes will release the last applications for the 5.5 biturbo within these next two calendar years in the new GLE63 AMG and upcoming S63 AMG convertible. After that, even though it was only introduced in 2011, it will be phased out. Fortunately Affalterbach has a worthwhile successor already in place in the 4.0-liter twin-turbo V8 from the Mercedes-AMG GT. The smaller powerplant, already in store for the new C63, is already producing 503 hp and 479 lb-ft in S spec. That's still shy of the larger unit's output, but where the 5.5 is nearing the end of its production cycle, the 4.0 is just starting out. Of course the 4.0-liter biturbo isn't the only engine AMG is making these days. Smaller models (based on the front-drive platform) employ the 45-designation, high-output 2.0-liter turbo four. Models at the very top of the lineup, however, use a 6.0-liter twin-turbo V12 that may be a dinosaur, but with 621 hp and 738 lb-ft of torque on tap, still can't be beat.

Win a car while supporting a charity this holiday season

Autoblog may receive a share from purchases made via links on this page. Pricing and availability are subject to change. No donation or payment necessary to enter or win this sweepstakes. See official rules on Omaze.  The leaves have fallen, there is a crispness to the air and there have already been multiple forecasts of snow, which can only mean one thing: We're coming up on Christmas. While you've been busy thinking about what kind of gifts you're going to give your loved ones, we here at Autoblog have been deciding which dream car we'd like to see in our driveway on Christmas morning. A car for Christmas does seem a bit extreme and expensive, but thanks to these Omaze sweepstakes, it doesn't have to break the bank. Here are the current sweepstakes we'd like to win this holiday season. Win a DeLorean DMC-12 - Enter at Omaze James Riswick, West Coast Editor: Let me be clear, the DeLorean is a pretty terrible car. Its speedometer doesn't even go up to the fabled 88 mph. Seriously, look at the pictures: tops out at 85. Also, who services a DeLorean? And how much would it cost to maintain one? $AlloftheMoney or just $MostoftheMoney? So owning it could be a total headache, but at least by winning one through Omaze, you'd be relieved of the financial burden of buying one in the first place. You'd also get the chance to own one of the most iconic cars of all time, one that transcends car enthusiasm and is instantly recognizable by everyone as the "Back to the Future" car. Plus, "everyone" doesn't know that the DeLorean was actually a pretty terrible car. So, I already own James Bond's car from 1995, why not Doc Brown's from 1985? Win a 2021 Bentley Bentayga V8 - Enter at Omaze Eddie Sabatini, Production Manager: Why am I choosing a +$200K Bentley SUV? Because even if I could afford one I'd never be able to wrap my head around spending money on one. So why not try to win one by donating what I can afford to a good cause? I first saw the Bentley Bentayga up close and personal at the Frankfurt Motor Show (I forget which year but I'll never forget this SUV). And although it looks like the Bentayga Omaze is offering up doesn't have the opulent tailgate setup I fell in love with when I saw it in Frankfurt, I'd still enter to win. Win a 1968 Mercedes-Benz 280SL Pagoda - Enter at Omaze Byron Hurd, Editor: Few automotive marketing efforts stick out in my head more than the Mercedes-Benz holiday spots and magazine placements.