2010 Mercedes-Benz S400 Hybrid- a First for Mercedes-Benz by aihaozhe2

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									Most automakers pick compact or midsize models when they decide a
gasoline/electric powertrain is the sensible course. Yet, when Mercedes-Benz decided
to develop a hybrid, planners went all the way to the top of the line: to the luxurious
S-Class "flagship" sedan, as facelifted for 2010.

The new S400 Hybrid isn't the first full-size luxury sedan to assume gasoline/electric
operation. Lexus launched its LS 600h L sedan, with a comparable hybrid powertrain,
as a 2008 model. Both companies evidently believe there's a significant urge for
greater fuel economy and reduced emissions, even at the upper end of the economic
scale.

One big difference lies in the battery. With the S400, Mercedes-Benz is the first
automaker to issue a series-production model with a lithium-ion battery pack that fits
into the engine compartment. Except for seldom-seen Fisker and Tesla cars, other
hybrids use nickel metal hydride batteries.

Under the S400 hood, a 3.5-liter V-6 gasoline engine generates 275 horsepower and
258 pound-feet of torque. A 15-kilowatt electric motor is located between the gas
engine and the seven-speed adaptive automatic transmission, which incorporates
Sport and Comfort modes. The electric motor adds 20 horsepower, for a total of 295;
plus 118 pound-feet of starting torque, to boost acceleration when taking off.

Unlike some hybrid-powertrain vehicles on the market, this one does not have a full
hybrid system. The engine shuts off automatically as you slow down and come to a
halt at a stoplight or stop sign, but the S400 Hybrid cannot run on battery power alone.
Electricity augments the gasoline engine, but cannot substitute its function. In some
hybrid models, the gasoline engine shuts off and restarts with a bit of a bump. Not
here. It's nearly impossible to discern the transition between engine shut-off and
subsequent start-up at a stoplight.

The rear-wheel-drive S400 Hybrid gets a fuel-economy estimate from the
Environmental Protection Agency (EPA) of 19 mpg in city driving and 26 mpg on the
highway—comparable to a smaller gas-engine car. In contrast, the Mercedes-Benz
S550 sedan with a 382-horsepower V-8 gets a mileage estimate of only 15 mpg
city/23 mpg highway. Naturally, the S600 with its 510-hp V-12 engine is even less
thrifty. Built on a 124.6-inch wheelbase and measuring 206.5 inches long overall, the
S400 Hybrid is a substantial automobile, weighing at least 4,390 pounds. That's a lot
for any powertrain to push.

Everything is super-smooth in the S400 Hybrid, just as it is in every S-Class sedan.
After all, this is Mercedes-Benz's prime model: the very top of the sedan lineup in
terms of luxury and comfort/convenience. So, you get nearly every S-Class benefit
and element of elegance, coupled with the promise of consuming less fuel and
yielding fewer emissions.
With a 0-60 mph acceleration time of 7.2 seconds, performance admittedly falls short
of the capabilities of the S550 sedan. Even so, the S400 Hybrid comes close enough
to satisfy most potential buyers in this league. Only the most ardent high-end hot
rodder is likely to grumble about any shortage of screaming acceleration. And those
folks aren't likely to lean toward a hybrid of any class, much less the upper-luxury
S-Class. Even an S550 or S600 doesn't satisfy everyone, which is why
Mercedes-Benz's AMG division turns out super-performance S63 and S65 editions.

Every S-Class model, including the S400, is loaded with technology and driver
conveniences. The standard Pre-Safe system can sense an impending collision and
tighten seatbelts, as well as apply additional braking force. Mercedes-Benz also offers
a Driver Assistance Package that includes a Blind-Spot Alert, Lane-Departure
Warning, and Distronic Plus adaptive cruise control. New Attention Assist is a
driver-fatigue alert system that provides both an audible and visual warning when it
senses lack of alertness.

Back-seat video entertainment with dual screens is offered. A Rear Seating Package
includes four-zone automatic climate control, a rear-seat memory, and
heated/active-ventilated rear seats. A Sport Package includes several appearance items,
and may be augmented by a panoramic moonroof. Night View Assist Plus is another
extra-cost option, but 20-inch tires are a no-charge alternative to the standard 18-inch
rubber. Although the S400 Hybrid is the lowest-priced S-Class model, it's hardly a
giveaway at $88,825 (including destination charge). Still, the gasoline-engine S550
sedan stickers for $93,475.


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