All right, all you armchair aerodynamicists of Ecomodder (alliterative and otherwise). Here's another quiz for you:
Below are three GIFs of tufts on the back window of a 2013 Prius liftback, taken on my cellphone taped to the trunk floor, looking up at the window. There is no antenna on the car (shark fin or wire), no washer nozzle, and no wiper. All three videos were taken at 55 mph indicated on the same section of road, northbound into a 15 mph NNE headwind.
The first GIF is your baseline. For the following two, I changed one thing--that is, there is exactly one change from the baseline configuration in each of those two videos. What are the changes?
Baseline:
Altered 1:
Altered 2:
