The 2021 Expedition XL STX provides 375 hp from a 3.5-liter V6 engine. Enhanced by twin turbochargers, the EcoBoost powerplant spits out 470 lb-ft at low tachometer levels. Engineered for off-road handling, the Intelligent 4WD System is optional for this base-level Ford SUV. You can seamlessly cycle through multiple driving modes in the Terrain Management System.