Driving the rear wheels via a sophisticated seven-speed automatic transmission, the two power sources make the S400 feel every bit as lively as the conventional S550 version with its 382-horsepower V8 engine.

FORBES: Mercedes-Benz S400 Review: Electrified Flagship

Also, the six-speed automatic transmission in my test car (no manuals available in the U.S.) was a little bit fussy, and there were occasions when the engine-transmission software was momentarily stymied as to which gear to jump to.

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