A vehicle, in particular a passenger car or truck, having a front end and a rear end and a longitudinal axis extending between the front end and the rear end, having at least one energy conversion system, in particular present outside the body of the vehicle, for converting wind energy generated by headwind of the vehicle into electrical energy, comprising at least one rotor having a rotor axis of rotation, comprising a plurality of rotor blades extending radially with respect to the rotor axis of rotation, wherein the rotor has an inflow direction which corresponds to the rotor axis of rotation, in particular is parallel to the rotor axis of rotation, and a flow housing with a rotor mantle, which surrounds the rotor, in particular entirely, wherein the rotor rotation axis is oriented substantially parallel to the longitudinal axis or forms an acute angle with the longitudinal axis, wherein the intersection of the longitudinal axis and the rotor axis of rotation is closer to the rear end than to the front end of the vehicle, and wherein the energy conversion system is closer to the rear end than to the front end of the vehicle, in particular is mounted on the rear, wherein a first wind funnel is arranged upstream of the rotor mantle and tapers in the direction of the rotor mantle, and wherein a second wind funnel is arranged downstream of the rotor mantle and widens in the direction away from the rotor mantle, wherein the first wind funnel is adapted and arranged to receive headwind and the second wind funnel is adapted and arranged to direct the output airflow in the direction of the vehicle end counter to the direction of travel, wherein the second wind funnel is arranged so as to be pivotably movable transverse to the vehicle longitudinal axis about the end of the rotor mantle, such that the inflow angle of the output airflow with respect to the guiding unit of a vehicle changes. at least one rotor having a rotor axis of rotation, comprising a plurality of rotor blades extending radially with respect to the rotor axis of rotation, wherein the rotor has an inflow direction which corresponds to the rotor axis of rotation, in particular is parallel to the rotor axis of rotation, and a flow housing with a rotor mantle, which surrounds the rotor, in particular entirely, wherein the rotor rotation axis is oriented substantially parallel to the longitudinal axis or forms an acute angle with the longitudinal axis, wherein the intersection of the longitudinal axis and the rotor axis of rotation is closer to the rear end than to the front end of the vehicle, and wherein the energy conversion system is closer to the rear end than to the front end of the vehicle, in particular is mounted on the rear, wherein a first wind funnel is arranged upstream of the rotor mantle and tapers in the direction of the rotor mantle, and wherein a second wind funnel is arranged downstream of the rotor mantle and widens in the direction away from the rotor mantle, wherein the first wind funnel is adapted and arranged to receive headwind and the second wind funnel is adapted and arranged to direct the output airflow in the direction of the vehicle end counter to the direction of travel, wherein the second wind funnel is arranged so as to be pivotably movable transverse to the vehicle longitudinal axis about the end of the rotor mantle, such that the inflow angle of the output airflow with respect to the guiding unit of a vehicle changes.