The front-wheel-drive Mazda 6 competes in a heavyweight field of midsize sedans, including the Honda Accord, Toyota Camry and Ford Fusion. Sleek and evocative, it's the most eye-catching among them, while bringing the best roadside manners. It was last redesigned for 2013, refreshed for 2016, infotainment-updated in 2017, and now, for 2018, gets a powerful new engine.