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I think complications come from having a 2D template with only a side view trying to define an optimal 3D form.
Just about every vehicle on that template pic is very aerodynamically efficient, yet just about every vehicle has a backlight that is steeper than the template. I don't think they'd have the low Cds if they suffered separation at the top of the backlight.
And then there are those like the Rumpler and the Boxfish that are aero but don't conform to the template very well at all.
Still, I like the template because if one uses it they won't go way wrong.
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