Julian, 5% was asking for quite a lot from just a rear undertray if you ask me.
If the wheel fairings would have had rounder edges, if you would have done the same for front wheels (like you did for the 1st gen Prius), and if you had put small boat tails behind both rear and front wheels, along with full rear wheel skirts. I'm pretty sure you would easilly get your 5% right there.
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