PARIS – The engine control strategy Mercedes-Benz designed for its hybrid-electric S-Class coming to market next June will save fuel even on the highway. The M272 V-6 engine in the S400 Bluehybrid is tuned to the Atkinson cycle, in which intake valves are held open longer. The reduced torque at low engine speed is compensated by the motor and, at constant speed and load, the engine is more fuel efficient. Without such special tuning, the extra 165 lbs. (75 kg) of the hybrid package at ...

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