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Hi bestmapman - welcome to the site.
The Aerocivic is a stunning machine isn't it?
I've added skirts to my car, and measured about a 3% efficiency gain at 80 km/h / 50 mph. I also attempted a number of tests (admittedly flawed) to measure the effectiveness of skirts on a 2007 Camry Hybrid, as well as a 2006 Corolla. Just so you don't get your hopes up too much, I'd estimate that rear skirts on a sedan like your Prius will probably only improve efficiency slightly - ie. in the range of 1-2% at around 55 mph.
That said, in my books, 1-2% is worth chasing!
A number of people here have posted pictorial DIY's on skirt construction. I'm just heading out, but if you don't turn them up before tomorrow, I'll post links.
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