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That thing needs an air dam real bad. The nose is way too high.
The rear window is just a bit too steep, which imho is the worst you can do. Make it real steep and it would cause less drag.
It is a long car - length has no effect on Cd, it just adds more surface to have drag on -and I bet the underside is one big aerodynamic mess.
The wing just enlarges the wake.
Cd 0.4? They must have been doing something right too then!
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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