This competitive sports sedan is enjoyable to drive and has a beautifully finished interior. The base C300 uses a 2.0-liter turbo four-cylinder, which returned a respectable 26 mpg overall in our AWD version. The C has quick reflexes, with prompt steering response and a comfortable ride. Inside, you'll find an upscale and snazzy cabin with a high-quality feel, but the complex infotainment system takes time to master. Semi-autonomous highway steering is optional, and autonomous braking is standard. The rip-roaring C63 AMG gets a 469-hp, twin-turbo V8 in standard form or 503-hp in the S version. New additions include a C350e plug-in hybrid and C43 AMG. Reliability has been below average. A new coupe version is available on 2017 model.