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My first thought:
Sanity check fail.
But look at the biggest ways your model deviates from the car. The road moving at the speed of the car impedes airflow underneath, increasing drag. You lack tires, so your reference area was smaller, increasing Cd. And I assume you used hard chines instead of large radii on the left and right edges of the car, which would contribute substantially to drag.
I would advise against a scaling factor. Instead, look at it as "Feature X provides an improvement of x%" or "-0.0x Cd".
What's the chance you can get valid, usable results from SW2010, and use them as a basis for engineering decisions? And what effect would my Insight model's tail extension have on drag?
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