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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.

Pre-Race notes from the 2015 Nurburgring 24-Hours

Autoblog has come to the German countryside to watch the Nurburgring 24-Hour race, and just one day in, we have to say it's outstanding. Le Mans has been the highlight of our summer racing schedule for the past few years, the 'Ring 24-Hour event being the appetizer we always skipped. Earlier this year, however, while visiting Miami to check out the Cigarette Racing 50 Marauder GT S, we met Scott Preacher. He oversees digital marketing for both Cigarette and AMG during the week, then comes to Germany to compete in the VLN race series on the weekends, driving an Aston Martin Vantage GT4 for Team Mathol. If Le Mans is the Oscars of endurance racing, the Nurburgring 24-Hour race is the Screen Actors Guild award – the one voted on by the actors, for the actors. In this case it's the race by the teams and fans, for the teams and fans, even though the increasing manufacturer presence has altered the team equation. We were told that it wasn't so long ago that true privateers could win the overall, but that's not really the case anymore. Front-running teams have heavy factory involvement – Audi Sport Team Phoenix, for instance, which finished in first and third last year, has its own 'Ring race center and is running the 2016 R8; Aston Martin is represented by Aston Martin Racing and Aston Martin Test Center, and Bentley has a Bentley Motors team and uses HPT to run another team. The fan component hasn't changed, though, and you can't talk about the race for more than 60 seconds before someone brings up the battalions of spectators. Every driver we spoke to cited them as the most incredible part of this race after the track itself. It feels to us like a giant German Sebring, with thousands of people camped out in the ginormous, forested infield, many of whom have been here since Monday erecting their ornate camping compounds. There will be parties everywhere Saturday night, and so much bratwurst on the grill that the drivers can smell it when as they're blasting full speed through Wehrseifen. Even when we drove a Mercedes S63 AMG Coupe on a lap before the race, the fans waved like it was a competition. Scott Preacher's Australian co-driver Robert Thompson said, "You come around a corner and it's like you're driving full speed through the middle of a carnival." The race field itself could also be called a carnival, with an officially invited field of more than 170 cars. Even on a track that's 24.4-km long, that's like racing on the 405 at midday.

Mercedes may not be done with R-Class after all

The idea of blending a three-row SUV and a minivan into a luxury model like the Mercedes-Benz R-Class still seems wonderfully absurd, particularly when you consider that there was an AMG version of that German people-mover. Apparently, though, one of the brand's execs doesn't believe the concept behind the R-Class is all that bizarre. In fact, he thinks it could be time to try again. Wolf-Dieter Kurz, Mercedes' vice president in charge of SUVs and sports cars, believes that crossovers could be a major driver of product variants in the future due to their popularity. There are a lot of design possibilities to explore in the segment, in his opinion. "There was already one that we had in the portfolio – maybe we were too early – which was the R-Class, which we are still selling in China. It's doing good, with 12,000 to 14,000 units per year," Kurz said during the launch of the GLE and GLE Coupe, according to CarAdvice. Under a recent deal, the quirky model is made by AM General and exported out of the US. Kurz even suggested the exact niche that the new model might fill. "So let's say these more, let's say, on-road based but still very roomy, but not station wagon, is definitely an interesting segment also in the future," he said, according to CarAdvice. That almost sounds like a blend of wagon and SUV in a move not too dissimilar from the current Subaru Outback or the old R-Class. One hurdle for any future model reviving the concept of the R-Class is that the company is already bursting with CUVs. Every size is practically already filled with the GLA, GLC, GLE, and forthcoming GLS, plus Coupe variants for some of them.