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These papers aren't even mentioning some pretty important aero considerations, namely:
-lift produced
-cross wind stability
-wind noise
-centre of pressure changes due to changes in pitch
Low drag is great, but they would be sacrificing real world fuel economy if the powertrain and suspension have to be compromised to achieve it. The driver would be fighting the car all the time and probably waste fuel in the process.
I think that is why cars like the insight and prius are still pretty 'aerodynamically conservative', so to speak.
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