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I'm with basjoos - undertray is also an important target. I know someone with a 2nd gen Prius who recently added a front tray and saw results from it, which he's still confirming by collecting more data.
I went to the local Toyota dealer this week with the specific intention of looking at the car's underbits - I think there's room for improvement in the rear floor area. (Unfortunately, they didn't have any on the lot or in the showroom for me to see.)
Also: I'd highly recommend playing with cardboard or coroplast & duct tape as a way of prototyping what you have in mind.
Lastly, I'd start at the rear rather than the front, for maximum gains first.
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