What is it? Buick has introduced more powerful trim level for its Regal sedan, with a 2.0-liter turbocharged four-cylinder engine. The new engine produces 255 horsepower, and Buick claims it can spring 0-60 mph in less than seven seconds. Drivers can adjust suspension and steering settings between three modes: standard, sport and GS.

The Regal GS has a long roster of comfort and convenience features that includes keyless entry with push-button start, nine-speaker 320-watt Harmon/Kardon premium stereo, Bluetooth connectivity, leather upholstery and trim, heated power seats, 120-volt power outlet, front and rear park assistn, and Bi-xenon HID headlamps. Large 19-inch wheels are standard, and even bigger 20-inch polished wheels are optional.

CR's take: The 2.4-liter four-cylinder and six-speed automatic are refined but a bit underpowered, and returns an unimpressive 23 mpg overall. For real punch the turbocharged 2.0-liter, 220-hp four-cylinder is a better choice. Now, the GS will provide even more thrust and standard amenities.

When will it be available? Second half of 2011