A Breakdown of What a Spoiler Does for Your Vehicle - Westech

To lower wind resistance (or drag), spoilers are designed to alter the airflow above, around, and below cars. By "spoiling" airflow, they lessen the detrimental consequences of that airflow. This, in turn, increases downforce and increases traction at high speeds. During the 1960s, spoilers began to appear on race cars and other high-performance vehicles to improve their aerodynamics (the way air flows around a car). Automobile manufacturers were later compelled to modify the aerodynamics of all their models to achieve better fuel efficiency ratings under government rules. At highway speeds, a car with less wind resistance consumes less gasoline.

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Westech Performance Group