I think you'd see some gain- say, 10% vs the- say, 50% on the Pinto (turbulent wake reduction, not necessarily Cd reduction or fe increase). My understanding of it is, you can boattail quite nicely, and do things with spoilers re: that airfoil template, but wherever that bodywork ends, you still end up with a turbulent wake. Aerohead has a description of that phenomenon somewhere here.
Yours is kinda the difference between a regular minivan and an Aztek.
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