What happens when Mercedes adds a hybrid drivetrain to its largest sedan?

#9. This gas-electric Benz is a “mild” hybrid – in more ways than one

The S400 is powered by a 3.5-liter V6 capable of 275 hp and 258 lb-ft. of torque. It's aided by a 20-hp battery-powered electric motor. Unlike the Toyota Prius or Honda Insight, the S400 can't run in electric-only mode, hence the “mild hybrid” designation. Fuel savings could also be considered “mild.” With an EPA estimated 19 mpg/city and 26 mpg/highway, the S400 delivers 26% percent better fuel economy than a comparable S550. Translation? About four additional mpg – good enough to avoid the gas-guzzler tax. The S400 scores a few more green points for its use of recycled and renewable materials, including coconut fibers in the seatbacks.

Mercedes-Benz S400 Hybrid Research
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