Paper analyses the effect of the driving style induced by a supervising device on the total vehicle consumption. The study is performed by computing the energy and fuel consumption, and the CO 2 emission of several cars associated to five vehicle segments. The driving profiles are derived from WLTC for low, medium, and extra high cycles by introducing acceleration events typical of three driving styles. From simulation results, the driving style shows significant impact on energy consumption and CO 2 emissions in particular for urban scenario where acceleration induced power request is predominant with respect to running resistances that are predominant at higher speeds typical of extra-urban and highway scenarios.