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Hybrid electric vehicles (HEVs) would contribute to energy saving and greenhouse effect reduction if they were to be massively launched on the market. A notable effort has been done in simulation to optimize energy consumption and component sizing. Power-hardware-in-the-loop (PHIL) simulation could be a further step to obtain more realistic performance and to compare different solutions, including economic aspects. This paper deals with the implementation on a high dynamic test bench of a diesel mild parallel HEV using the PHIL technique. Three configurations, corresponding to different energy-storage systems, have been tested under the same conditions. Power, energy, consumption, and pollutant emission performance, which are measured on the test bench, are compared and discussed.