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The present paper deals with the activities and the results achieved under a cooperative research project between IFP, D2T, LMS, G2Elab and Renault focused on Hardware-in-the-Loop (HIL) applications to hybrid power-trains conception and assessment. The main goal of this study is the evaluation of hybrid propulsion concepts and the benefits of different degrees of hybridization in a flexible architecture, by using a chain of simulation platforms: from the co-simulation to the high-dynamic engine-in-the-loop test bed, through a virtual version of the last one. The activity assessed the potentialities in terms of fuel consumption reduction and the challenges in terms of pollutants emissions of micro and full-hybrid application for light-duty vehicle based on gasoline engine: over several road load cycles as NEDC, FTP72, ARTEMIS.