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Sorry, I posted this on the "Haxagonal dimples" thread before I discovered the Mythbusters thread, so here goes again:
The dimples on the roof are probably beneficial (IMO). It looks to me like the rear window area is about the worst angle it could be for drag (if I remember my Hucho, 30 degrees is worst, 15 best...YMMV) and the dimples near the back of the roof are probably detaching airflow over the rear window. A little spoiler up there would do it better I'd think, but anything would help.
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