Abstract: A tubular air screen producing device is mountable on a draft vehicle adapted to tow a trailing vehicle therebehind and has an air inlet end in the direction of towing and an air outlet end for discharging a screen of air toward the horizontal and vertical edges of the front end of the trailing vehicle. The outlet end of the device is of smaller area than the inlet end and is configured to direct a screen of air toward the trailing vehicle edges at a velocity higher than the velocity of air relative to the draft vehicle moving at a given velocity relative to ground. The high velocity air screen streamlines the area between the draft and trailing vehicles and shrouds the space therebetween, so as to minimize air turbulence in the space and along the top and side walls of the trailing vehicle. Thus, air drag is reduced and fuel economy is increased in connection with the towing of a trailing vehicle.