Quote:
Originally Posted by Old Tele man
Dust brake shields mount behind the wheel, between the rim and the brake hub; whereas wheel covers mount on the outside of the wheel, in the actual air slip stream. The dust shield will mitigate some of the turbulence within the wheel well, but is not anywhere as effective upon the air slip stream that's passing over the outside of the wheel assembly as a smooth wheel cover.
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I get that but I want to know if anyone has test the difference, cost and time its easier to just plug and play. But if you can gain even a 1mpg more the cost and time could pay out better for pizza pans.