Quote:
Originally Posted by mpg_numbers_guy
You will likely notice more of a benefit with rear wheel covers than front wheel covers. I removed the front wheel covers from my Civic when I had it and left the rear ones installed, and didn't notice and discernible fuel economy loss. My theory is that rear wheel covers have a larger effect since they're near the rear of the car, and any flow disruption near the rear of the car will add more drag.
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Some observations have indicated a greater drag reduction from the front skirts. I know this to be true for a 1930s Adler coupe and the 1983 Ford Probe-IV.(9% in the case of the Ford).
I do agree that if the fronts are done,then you've got the best onset flow available to the rear of the car,which amplifies the ability of the rear skirt,hence pressure drag advantage.