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I put in a few hours of driving today. Subjectively, the buffeting, which was already low, is reduced. With the windows up (top down still) it's virtually zero, and there is almost zero wind noise.
My last tank average was right around 36mpg, though it was almost 100% city driving. I'm about half a tank into the next one, and I'm sitting at 38mpg. Possibly no relation to the deflector, but rather, just environmental conditions.
I saw this fabric (?) deflector in the video you linked, and it gave me some ideas. It might also be interesting to see if there's a specific height where a spoiler would help. To my eye, the trunk lid's trailing edge is probably too low to spoil the air.
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