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Actually that won't work for me, because I am considering trying it on the fog lights on my Subaru, which are inset low into the front bumper. They are at the far outside edge of the bumper so I suspect they disturb airflow around the sides of the car.
In any case, if it won't make a measurable difference in FE, I am not interested. There is a FE gauge built into the car, so I may try an a-b-a test on a stretch of highway, using cardboard covers taped into place. The hangup may be that the smallest FE increment the meter will show is 0.3 mpg, or about 1%. I don't know if the covers will make that big a difference. Their total surface area is about 0.5 sq feet, and the Subie's effective frontal area (Cd X area) is about 7.5 sq ft.
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