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Hi Chris,
Not too sure if there is any effect with those visors, other than the effect of the visor itself (with the window up). I have on occaision in the summer reduced fuel consumption by tuning the amount of opening of the down wind rear window opening. The amount of opening is only about 1/4 inch or so. Any larger than 1/2 inch makes worse mileage.
This is easy in the Prius as they all have power windows and the fuel economy display. Typically, the difference is about 5 mpg in the Prius when running down the road at 60 mph into a steady 10 to 20 mph off-center head wind. So like from 50 to 55 mpg.
The concept is to inject air into the zone where flow seperation might begin due to the off-center flow.
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