The ML450 Hybrid is Mercedes' first use of the two-mode hybrid system developed in cooperation with GM, Chrysler and BMW. The all-wheel-drive ML450 gets an Atikonson-cycle 3.5 liter V6 and two electric motors, for a combined output of 335 hp and 381 lb-ft of torque. EPA fuel economy figures are 21 MPG city, 24 MPG highway.