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Previously someone posted a couple articles regarding aerodynamics and fuel economy. Some ridiculous amount of a car's drag (+10%) is the result the front tires. It's not only the frontal surface area of the tires, but air being pulled into the wheel well. Those rubber guards help direct air out and away from the wheel wells. I'm not sure you would notice much of a difference when driving, but apparently they do contribute to fuel economy. If I remember correctly, it was estimated to be about 1/2 mile per gallon. Seems kind of crazy, but makes sense why they are there.
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