If all other things were the same, wheels, tires, ride height, fender flairs, bed covers, mirrors, etc. And the only difference was that bumper cover I would say there would be no difference. Although the SS cover looks lower, the regular setup has a rubber deflector tucked back that sits just as low and would accomplish the same thing.
But the SS does have no fender flairs and a lower ride height. Problem is, a thirsty 6.0 motor and a heavier duty automatic that has more parasitic losses.
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