The aim of the paper was to analyse the effect of an electric vehicle's acceleration intensity on energy consumption in a real road test. The research involved vehicle the urban Skoda Citigo-e iV equipped with a proprietary measurement system. Acceleration tests were carried out at different accelerator pedal positions, analysing kinematic and energy parameters, including energy consumption, speed, acceleration and power. The paper introduces a dynamics index, combining power train capacity with unit energy consumption, allowing an objective comparison of vehicle energy and traction efficiencies. The results indicate that moderate acceleration up to about 40% pedal position is the most energy efficient. Further increases in power result in a significant increase in energy consumption with little dynamic acceleration. The electric vehicle's acceleration dynamics were compared to those of an internal combustion vehicle which showed similarity in terms of the moderate acceleration area. The results show that moderate acceleration is the most energy-efficient and the presented acceleration dynamics index allows for an objective comparison of the efficiency of different power trains.