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An issue I've noticed on my car (with no side mirrors) this week with tuft testing is the assumed horizontal airflow around the mirror is not correct (at least not on my car, I think most others would show similar results). The airflow where the mirror was is actually inclined in an upward direction (about a 45 degree angle or therabouts) so mirrors that look great for horizontal flow are not even close to good for what's actually happening. I see many mirrors that are flat on the bottom which seems to be the about the worst design.
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