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I'm not an aerodynamics expert. But my hunch is that a differently shaped "greenhouse extension" would get better results. For example, a fastback might be more apropos than a kammback. But a fastback would need to be made of transparent material (assuming you want to retain rear window visibility).
I hate to say this, but your time / effort / money may be better spent on aero mods that are easier to execute. After you've done all the easy stuff, if you're still itching for that last bit of aerodynamic efficiency, then you can revisit this project.
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