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" When it was introduced, the Mercedes-Benz CLS pioneered the concept of coupe styling with four doors. While the latest iteration of this vehicle has lost some of its sleekness, this bolder approach to styling\u2014a more aggressive grille and haunches over the rear wheel arches\u2014actually enhances the appeal of the AMG version.   Our test car is equipped with the $7300 AMG Performance Package, which aside from adding carbon-ceramic brakes raises the horsepower to 550 bhp (from 518) and bumps the torque from 516 lb.-ft. to a whopping 590. Inside, the sporty nature of the car is further enhanced by the nicely bolstered sport seats, use of Alcantara trim and the squared-off design of its sport steering wheel.    Performance from the twin-turbo 5.5-liter V-8 is strong\u2014the CLS63 AMG rips off 60-mph sprints in 3.8 seconds, the quarter mile in 12 flat and 100 mph comes up in just 8.3 sec. The tauter suspension and sticky performance tires enable the car to fly through our slalom at 70.3 mph and pull 0.93g on the skidpad.   Even though this is a modern muscle car of the first order, the ride is supple enough to make it an everyday driver. And despite the sharply raked C-pillar, rear passenger comfort is quite good once you get through the door. Best of all are the rorty exhaust note and lightning-quick shifts from the 7-speed mct automatic. Now one really doesn&amp;#039;t expect fuel economy to be a concern to someone who can afford a $130,000 car producing 550 bhp. Still, in economy mode, the AMG has a seamless stop-start system that helps with in-city mileage. With this kind of performance, every little bit helps.   "^^<http://www.w3.org/2001/XMLSchema#string>
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