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Weekly Recap: Automakers rethink the definition of luxury

Variety is the spice of life, but it's becoming a prerequisite for luxury carmakers in the ultra-competitive US market. The Detroit Auto Show was strong evidence of this reality. It's not enough to offer attractive and well-appointed cars and SUVs anymore. Luxury brands that want to be competitive need to invest in everything from high-powered supercars to clever hybrids. To be relevant, you need to be green and mean – and everything in between. As General Motors product chief Mark Reuss said after the reveal of the 640-horsepower Cadillac CTS-V: "We are not leaving anything on the table." He was speaking for Cadillac, but he might as well have been speaking for the luxury car market. The CTS-V debuted in Detroit about an hour after Lexus surprised showgoers with the reveal of the RC F GT3 race car and then announced ambitious plans to return to competitive racing. That almost overshadowed the fact Lexus had just revealed another potent addition to its growing F line, the 467-hp GS F. View 20 Photos But for luxury brands, it's not just about maximum horsepower for well-heeled enthusiasts or decadent amenities for the Grey Poupon set. Strong competition from all corners has forced automakers to refine and expand their lineups in ways unforeseen even a few years ago. Case in point: Mercedes-Benz finally has an answer to the BMW X6, rolling out the GLE coupe in Detroit. The X6, which blends coupe-like styling cues with some of the functionality of an SUV, debuted in 2008. Back then it was a punchline, but seven years and more than 260,000 sales later, the X6's success has compelled Benz to respond. Mercedes – one of the strongest proponents of diesel technology – also debuted the C350 plug-in hybrid sedan, which promises a range of 20 miles on electricity, though fuel economy figures were not announced. The car pairs Mercedes' well-received 208-hp turbocharged four-cylinder with an electric motor for total output of 275 hp and 443 pound-feet of torque. Meanwhile, Infiniti will add the Q30 hatchback to its lineup by the end of the year, new president Roland Kruger reiterated in Detroit. It's expected to be joined by a crossover variant, and the additions will help strengthen Infiniti in the United States and abroad. "While we're expanding our product line, we're also expanding our market reach," he said. That's something echoed by Jaguar executives, who are preparing to launch the brand's first crossover, the F-Pace, in 2016.

Next Mercedes E-Class to get quad-turbo inline-six, augmented reality

It's been 10 years since an inline six-cylinder engine sat up front in a Mercedes-Benz road car, but the straight-six shooter returns with the 2016 E-Class. According to a report in Car we'll see a modular family in gasoline and diesel versions, and Auto Evolution adds that the bore and stroke will be shared by both fuel types. Car says a 2.9-liter diesel variant arrives first in global markets, putting out 313 horsepower when twin-turbocharged and "over 400bhp" when fitted with two more battery-powered turbos. Auto Evolution's numbers match those and add torque figures, with 516 pound-feet for the former and 627 lb-ft for the latter - but it makes no mention of the two extra turbos. AE believes the gas versions will ring in at 367 hp and 479 lb-ft, and 435 hp and 553 lb-ft. Keep in mind that until we hear it from Stuttgart, this is all (exciting) speculation. Elsewhere in E-ville, more aluminum and that scalable MRA platform mean a weight loss of somewhere between 154 and 330 pounds compared to today's car. Seven bodystyles (including the CLS-Class) will continue to make up the range, with the coupe and convertible growing a bit to provide proper four-seater comfort. It will bear the new standard for Daimler technology, showcasing the next step in the company's Intelligent Drive with features like phone-controlled self-parking in confined spaces and augmented reality in the heads-up display. Related Video: Featured Gallery Mercedes-Benz E-Class Spy Shots View 12 Photos News Source: Car, Auto Evolution Rumormill Mercedes-Benz Technology Diesel Vehicles Hybrid Luxury Performance Sedan augmented reality

Mercedes celebrates with World Championship edition SL63

Mercedes has plenty to be celebrating at the moment, having just won the Formula One World Championship in spectacular style – taking the constructors' title by a huge margin and the top two slots in the drivers' standings as well. It almost goes without saying that the German outfit would celebrate with a special edition, and that's just what we're looking at here. Presented at a special celebratory Stars & Cars event in Stuttgart in front of 50,000 jubilant fans, the Mercedes-Benz SL63 AMG World Championship 2014 Collector's Edition is based on Benz's twin-turbo V8-powered roadster but with some choice upgrades. Two versions will be offered: one in black with gold accents (displayed with the Silverstone circuit layout), the other in white with silver accents (and the Hockenheim map). One was designed by Lewis Hamilton, the other by Nico Rosberg. We'll let you sort out which one was done by which, but either way there'll only be 19 examples, each dedicated to a different grand prix circuit in the championship which Mercedes positively dominated – winning all but three, scoring eleven one-two finishes and landing on the podium at each and every one.