Agreed that localized application is sufficient. That model he's holding in the thumbnail -- they must have had an intern dimple the roof. Compare the hood and rear deck.
Can VG dimples form a vortex street?
Quote:
Kármán vortex street
In fluid dynamics, a Kármán vortex street is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid around blunt bodies. Wikipedia
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Interspacing might be a factor.