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Good luck on the experiments but I've not found any evidence of a measurable drag reduction with my 03 Prius. I observed the flow attachment with the vortex generators but it looks like the rotary motion at the base of the glass is not a major drag source.
My interest has moved on to reducing excessive cooling drag at the air inlet.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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