Chris914, if you are still on the list, what was the angle of the plane from the roof to the decklid on the fastback model you tested? Most studies show ~12-15 degrees optimal with a big jump in CD starting at ~20+ on road vehicles.
I measured ~22 degrees from this blueprint which would make it too steep for good CD reduction. Perhaps a little less slope would have yielded better Cd reduction than the stock roofline.
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