Here is Kamm's,FKFS' Walter lay-based research model, which was 'Kamm'd' on the roofline with the truncation portions.
The 'full Monty' is similar to Dark Aero,and measures Cd 0.12 with full 'skirts.'
BZP's mileage is so high,compared to his original baseline mpg,that I' feel like Dark Aero will be dancing in 0.12 territory when the front wheels get some women's clothing.