Completely redesigned from top to bottom, the 2007 Mercedes-Benz S550 is more powerful, more stylish, and more technologically advanced than ever. Its 5.5-liter V8 engine now produces 382 horsepower (80 more ponies than the outgoing model) and 391 lb.-ft. of torque (with 75 percent of that thrust available at just 1,000 rpm), yet maintains the previous S500’s fuel economy numbers of 16 mpg city and 24 mpg highway. All that power is linked to a seven-speed automatic transmission that drives the rear or all four wheels, and shift buttons are mounted on the back of the steering wheel spokes for manual shifting when navigating back roads at an enthusiastic pace.