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Localized flow with a leaf blower is better than nothing, but still lacks insofar as what happens on the road is both general and local flow. So, the area you blow may not necessarily flow that way on the road.
Bits of yarn and tape is cheap and easy, or do streak tests with dabs of dark oil or water-based tempura paint, see what happens at highway speed, then wash off. A chase vehicle with short digital videos, operated by a friend, would tell the tail.
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