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The energy consumption depends not only on the structures of vehicles but also on their operating conditions. For vehicles with the same structure, the operating conditions will vary from driver to driver. In this paper, considering the difference of operating conditions, the concept of statistical energy consumption is proposed to reveal the statistical law of actual vehicle energy consumption. In this paper, a plug-in hybrid electric vehicle (PHEV) is taken as the research object. Based on the distribution law of three vehicle use factors, i.e. vehicle mass, daily driving distance and driving aggression, Monte Carlo method is used to simulate and calculate the statistical energy consumption and statistical comprehensive energy consumption. Then, the energy consumption values that only considered the daily driving distance is calculated.