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I saw a CL up close yesterday while walking on the street, I feel like the rear is probably slipperier than most cars out there...The sides taper in more than a lot of cars (especially from that time period), the rear window has some nice big radius turns on the C pillars and slightly tapers in. Maybe some tuft testing first to see how the air is behaving? Just eyeballing it I would suspect that the air reattaches at the end of the trunk.
I think CLs are extremely pretty cars, if it were me I'd go for areas that don't impact aesthetics first, especially since your mpg is not that bad to begin with. I would cover the bottom up and block the grille first. The rear bumper has a nice angle to begin with. You could also put some subtle fairings behind the rear wheels.
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