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Vortices are bad for ground vehicles. If you consider the rear of a moving vehicle as having a drag-inducing partial vacuum because of its travel through air, then vortices will form a stronger local vacuum at the point where the vortices meet the rear of the vehicle. This results in more drag than with the general partial vacuum.
I believe you are thinking of small vortices generated by vortex generators placed on the skin of an aerodynamic body, to help boundary layer airflow. This is rather different than the effect I am describing with my aerocap. Besides, these vortex generators do not generally give much of an aerodynamic improvement.
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