Quote:
Originally Posted by redneck
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I like your method. 
Plus, using a Honda Insight with its high mpg capabilities, expands the scale of resolution to see and discern subtle differences more easily.
Are you going to try testing smooth wheel coverings too ? They will most likely fall below your 2% threshold but, they might move the needle enough to gain a little Insight. (pun intended  )
Looking forward to your results as you test the various aspects of automotive aerodynamics.
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I am not sure the Insight 'expands the scale of resolution' - the lower the CD, the harder it is to make improvements (but I suppose easier to see if you're increasing drag?).
I won't be running full wheel covers. I think the Insight wheels are already very good, and I want to retain brake cooling openings.