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I'm seeing a pretty solid consensus that the aero effect would be minimal. Really wish I had a way to test how much drag it added without and wind tunnel. The upper grill block gave me in the ballpark of 4 mpg on my daily commute. How much of that would be the reduction of drag and how much is attributed to faster warm up time. Just thinking if I made a smooth edge to the bottom of license plate to help contour air up to the face of the plate. It would allow the air to run smoothly over the plate and over upper grill block and continue as normal through the flow of the cars curvature.
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