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Using thin ribbons, I was able to confirm the vortex generators stopped a reverse flow behind the back glass. However, I could not measure an appreciable drag reduction at 65 mph.
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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