The headlights split and redirect airflow away from the door mirrors, reducing wind noise and drag.

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Better aerodynamics (replacing side mirrors with digital lenses, for instance, to reduce drag and wind noise), lower-resistance tires, low-voltage engine accessories, lighter vehicle structures there's a lot on the agenda.

WSJ: Ford C-Max Hybrid Energi: The Bawdy Electric

He was wrapped in the sensation of her absence, the gulls crying and circling, the crash and drag of the waves, a cold wind slicing underneath his clothes.

NEWYORKER: The Swan

Unfortunately, because of the nature of air circulation, any downward-pointing force created aerodynamically generates a backward-pointing resistance in the process just as an increase in the lift of an aircraft wing as the flaps are lowered for take-off or landing creates more drag in the process, forcing the pilot to open the engine throttles to overcome the extra wind resistance.

ECONOMIST: CAR DESIGN