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With the arrival of the 2011 CL-class, Mercedes-Benz has the opportunity to show off its latest advancements in powertrain, luxury, and safety, all wrapped in a two-door package. The big news for Mercedes' freshened coupe is under the hood of the CL550 4Matic, with the introduction of a new 4.6-liter V-8 producing 429 horsepower and 516 pound-feet of torque, coupled to a seven-speed automatic transmission.

The new Infiniti M56 is a masterpiece of style, both inside and out. The great curves over the front wheels give way to an opulent cabin with wonderful leather and wood in a spacious, airy package. This Infiniti interior is essentially my definition of luxury. I find the controls easy to use, but it seems that by now the rotary controller should be located on the center console, not a full arm's length away perched atop the center stack.

Americans have never been much for the metric system. We love our country miles and our cups of sugar, and we're happy to tell you what an ounce of prevention is worth. There's one metric measurement, however, that's as American as the ten-gallon hat, one that sets aflutter the hearts of Ford Mustang aficionados coast to coast: 5.0 liters - "five-oh" to the faithful. Cheekily rounded up from 4942 cubic centimeters, it's the engine displacement - denoted by an iconic emblem behind the front wheel arch - that defined Mustang performance for more than a decade, one so fundamental to the nameplate that Ford has brought it back to huge fanfare for 2011.