The Lexus' whirligig is familiar from the Toyota Camry and Avalon hybrids: a lean-burning Atkinson-cycle, 2.5-liter in-line four-cylinder (156 hp) coupled with two electric motors, one a 141-hp traction motor, the other a starter-generator.
WSJ: 2013 Lexus ES 300h Review: A Smooth, Elegant Guilt-Eraser | Rumble Seat by Dan Neil