[MetroMPG]

Yes. For my purposes, it keeps coming back to this question:

Are VG's are effective at reducing drag at the trailing edge of an abrupt cutoff (like the back of a van or hatchback) as they apparently are at delaying separation over a given radius - like airplane wings, rowing oars, or the roof/rear window transition on the Mitsu?

bryan says "yes".

The diagrams in the original post seem to suggest "yes".

Autospeed says "not likely".

And I remain respectfully skeptical. :P