This dissertation shows the analysis of the selected indicators of the work of a passenger vehicle drivetrain designated with the use of the Road Load Engine Simulator. In a digital simulation, an internal – combustion engine is saved in a form of numerical speed characteristics in the computers memory. Basing on a virtual vehicle, some indicators of the drivetrain of a passenger vehicle have been determined, while driving with five electronic throttle inclination regulator settups. The simulation results of e.g., throttle repeal speeds and fuel consumtion are summarized in a tabular and graphic form and some of them are expressed per 100 kilometer of the distance covered. Both synthetic and real driving cycles were analyzed during the study and their influence on the egines fuel consumption was also shortly described.