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Watch new Jaguar XF perform a literal high-wire act

Coming out with a new luxury sedan can be a truly daunting prospect. Make it too edgy and you'll risk disenfranchising what can often be a rather conservative customer base. Make it too conservative and you may fail to attract enough new customers or generate enough interest to make the endeavor worthwhile. Whether Jaguar succeeded in walking that thin line with the new XF is a matter of personal taste, blending as it does elements from the smaller XE and the outgoing XF it replaces. But in launching the new model, Jaguar didn't just pull of a figurative high-wire act – it did quite a literal one. To drum up support for its newest debut, Jaguar undertook the stunt depicted in the video above, stringing a pair of carbon-fiber cables some 60 feet above the River Thames in London. With some guide wires and counterbalance weights to keep it all in check, and a motion-picture stunt crew orchestrating it all, the new XF drove over 780 feet from one bank of the river to the other, setting a new world record in the process. Instead of thinking too hard about the whys (seriously, though... why?) and hows, we suggest you just watch the video above. Related Video:

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.

The Jaguar XKSS, famed ride of King of Cool, is new again

You might remember earlier this year, when we told you Jaguar had confirmed that it would follow up the limited-run of continuation E-Types – completely new, built from scratch classics – with a new run of the impossibly cool XKSS. Those folks in Coventry weren't pulling our leg, because we're here in LA and the brand new XKSS is here, too. Actually, they're 60 years late. If you remember the story we told you when Jaguar said it'd be building these things, there were originally to be 25 cars in total. 16 were built, and the other nine were destroyed in a fire at the Browns Lane factory. Thus, nine original XKSS cars have been missing, and the nine XKSSs that Jaguar will build for a cool GBP1 million each will round out the initial production run. If you're not familiar with the XKSS, here's a little background. Jaguar won Le Mans three times in a row in a factory racer known as the D-Type. After withdrawing factory support in 1956, some privateers continued on with the car, but Jaguar didn't. That left several D-Types sitting about Browns Lane in various degrees of completion. Sir William Lyons had them converted to road spec, which involved adding such niceties as a windshield and passenger door, but otherwise they were not far removed from the Le Man-winning cars they were based on. That meant that they were, to put it mildly, a lot of car for the street. The kind of person an XKSS appealed to was stylish and adventurous, and someone who craved speed. Someone like Steve McQueen, perhaps. His old XKSS is sitting in the Petersen Museum in LA, which not-coincidentally is where Jaguar assembled us to see the wraps pulled off the new one. The "new" XKSSs are generally faithful to the original design, with the bodies hand-formed off bucks that were themselves created off an original XKSS. The body is made out of exotic magnesium, an extremely lightweight metal which is often misunderstood to be extremely flammable. It is, but much more so when it's in little pieces, like shavings; formed into a car body, it's not quite the incendiary device you might think it'd be. Even the processes to form the chassis is the same, such as the bronze welding technique used to bond its tubing. A few concessions to modern safety are fitted, however. There's a fuel cell, partly due to the additional safety it provides but also to better resist the harrowing effects of modern ethanol blend fuel.