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aerohead: This is why I was thinking those airtabs might actually be a benefit in this situation. The two reports on airtabs that MetroMPG pointed me to were done on an '06 Camry and an '03 Prius, both smoother cars than mine. But even if I do try them (and really, given the design of the aluminum vortex generators, it shouldn't be too difficult to mock up some of my own on the cheap to get at least a rough guideline), I'm going to wait until I have my MPGuino installed and calibrated before I even think about testing VGs.
(I don't trust that picture either, even I'm not sure if it's level, and at any rate I get the feeling my camera (which is more than a few years old) warps pictures.)
Also, getting cfd software running will help too.
A rear spoiler off the edge of the trunk seems like it'd be really easy to do. Also, I get the impression that adding that sharp transition at the trailing edge of other parts of the car would help as well? like on the sides of the rear bumpers? (it's rounded there too)
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