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template
laack,please go to Search Ecomodder and key in 'Aerodynamic Streamlining Template Part-C and look at the second image posted there.Then consider scaling a side-view image of the Civic to fit in under the template as it is specified for use.
The curve will demonstrate a reasonable path the air would follow without separation.
You could fashion a foil for the back of the roof and also a upswept spoiler or straight back foil which pushes the Civic's body form closer to that of the template curve.
I believe that the airflow on top of your trunklid is not 'clean' enough to allow VGs to operate.
The upswept spoiler will force air to re-attach and it should lower the base pressure behind the Civic for an overall drag reduction.
You can see from the template that the air likes long,gently tapering aft-bodies.If you'll stay close to this form you'll see an improvement at the pump.
P.S. If your bound and determined to play around with VGs,you'll want them on the roof ahead of the drop off for the backlight.Check out the Mitsubishi R&D for their Lancer.For these things to work,they must be carefully scaled and placed.
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