ES300h’s hybrid drivetrain employs two electric motors—referred to as the MG1 and MG2 in Lexus jargon—in addition to the 156-hp, 2.5-liter four-cylinder gasoline engine. The MG1 is a motor/generator that operates primarily as an engine-driven power source for the batteries; it’s also used to start the internal-combustion engine after Eco-mode-prompted shutdown at stoplights. The MG2 handles the electric portion of propulsion and switches into generator mode during periods of deceleration to provide regenerative braking. Lexus doesn’t quote power and torque figures for the MG2, citing only a gas-electric-system total of 200 horsepower. In the Camry version of the setup, Toyota supplies ratings of 141 horsepower and 199 lb-ft of torque for the electric motor alone, and it’s a good bet the ES300h’s MG2 is packing at least as much.