M_a_t_t :
Your test results aren't as pronounced as mine were, but as you saw, we both had similar results.
Apparently, as Julian was saying, the area around the window has even more low pressure, and this is causing the tufts to point upwards towards the roofline even more.
I also got quite a bit of turbulence in my test.
And regarding the video suggestion for your channel Julian, I too agree that you could do something on the Tesla truck.
Not only would it be interesting, but you wpuld probably gain a lot more viewers, since this seems to be a popular topic when it comes to aero.
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