Audi's A6 has a comfortable ride and agile handling, strong performance, great seats, and excellent fit and finish. It's one of our highest ranked sedans and is a perfect long distance cruiser with a quiet, roomy cabin. The 2.0-liter, turbo four-cylinder works well, but has a raspy, less-than-luxurious engine sound. The 3.0-liter, supercharged V6 we tested is smooth and punchy, and returned a commendable 22 mpg overall. Front-drive versions get the four-cylinder and a seven-speed automated manual. All-wheel-drive versions can also be equipped with the four-cylinder, but use the smooth eight-speed automatic. The controls take some getting used to, but prove logical. A USB port is now standard, eliminating the annoying proprietary connector.