Bonneville spoiler!! Now that interesting.
The outer edges, that aren't attached to the quarter panel, do seem to generate wingtip vortices that are obvious in the rain. The "dirt trail" shows slowing of air behind, and in front of, the spoiler.
When passing/passed by trucks, this car is more stable than any other that I've owned. (Maybe this says something about the other cars that I've owned
) I think I'll try deleting it, for now, and see what happens. Or maybe I'm too lazy to put it back on.
Thank you for the reply