Around town the MKX is a quiet companion, with engine noises reduced to a whisper at cruise, tire noise low and outside traffic wooshes kept to a minimum. Get on the freeway and things get louder, with wind noise around the outside mirrors, noticeable tire noise and an engine drone that appears above about 65 mph. We were also annoyed by two rattles in our test car, one from the rear hatch and another from the driver’s door, which creaked over any kind of bump, steep driveway or any other chassis-related stress.