y reducing the drag, or resistance, imposed on a vehicle traveling at high speeds, aerodynamic equipment eases the load on the engine and improves the fuel economy of a vehicle. Airfoils, trailer gap reducers, side skirts, and tails are examples of aerodynamic equipment that fleets can install on trucks to reduce driveline losses. Airfoils direct air over the cab, trailer gap reducers lessen air turbulence by minimizing the space between the cab and the trailer, side skirts limit the air that circulates under the trailer, and tails reduce the turbulent airstreams dragging behind the trailer. EPA's SmartWay program provides lists of verified aerodynamic devices.
Many light- and heavy-duty vehicles (HDV) that manufacturers are developing have streamlined vehicle designs that reduce drag. More information on aerodynamic tractor and trailer equipment for HDVs can be found in the North American Council for Freight Efficiency's Confidence Reports.
Reprinted from afdc.energy.gov.com