The Nautilus is a refreshed version of the MKX SUV for 2019. Engine choices are either a powerful 2.7-liter V6 turbo or a 2.0-liter four-cylinder turbo. An eight-speed automatic transmission is standard. We found that the Nautilus with the more powerful engine delivers effortless power, a comfortable ride, a quiet cabin, and agile handling. The cabin is swanky, and the infotainment system is relatively easy to use. The only knock against this SUV is its unintuitive, fussy push-button gear selector. The unimpressive fuel economy of 18 mpg overall that we measured in the MKX should improve slightly, thanks to the new transmission. Lincoln has added new safety features, including a lane-centering feature and evasive steer assist that allows the SUV to steer around a vehicle stopped in front if the system determines a collision is likely and can't be avoided by braking alone.