"AWD with locking center diff: 3 differentials. Front, center, rear. Center diff may be mechanically locked. Typically also has 4WD low-range gears. Driver can shift between 2WD, AWD, 4WD-hi (center diff locked), 4WD-low (center diff locked)."
Good to know. So I can run "4WD" without any real penalty to fuel consumption unless the Sequoia determines that 4WD is needed?