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PSA Peugeot Citroën has unveiled a novel diesel-electric hybrid arrangement called HYmotion4 with the rear wheels driven by an electric motor and the front wheels by a diesel engine. The system is on show at the Paris Motor Show from today.

The system is on show in the Peugeot Prologue and the Citroën Hypnos concept cars. The Peugeot car, a family-sized saloon, can achieve fuel consumption of 4.1 litres/100km and emits just 109 g/km of CO2 with the new system, the group says.

HYmotion4 gives the advantages of four-wheel drive without the drawbacks in weight and fuel use, PSA said. The cars on show at Paris feature a 2-litre HDi diesel engine with FAP particulate filter, stop and start, and a six-speed compact automatic gearbox. The powertrain delivers a full 200hp.

The models shown at Paris are intended for production from 2011. The company said that by then it expected more than a million Peugeot and Citroën cars would feature hybrid stop and start technology.