Despite its output of 300 horsepower and 365 lb.-ft. of torque, the Lincoln Navigator's smooth-revving 5.4-liter V8 is merely adequate for the task of motivating 6,070 pounds of metal, rubber, glass, and chromed plastic. To its credit, the engine's behavior was consistent whether one or seven passengers were aboard, boding well for its 8,750-lb. tow capacity. The six-speed automatic transmission delivers clean shifts, features an overdrive-off button for downhill coasting, and sometimes kicks down enough gears to produce something close to impressive thrust. Rated to return 13 mpg in the city and 18 mpg on the highway with two-wheel drive, our Navigator four-wheel drive averaged 14.3 during a healthy mix of both.