Evo-Style Vortex generators?

[cfg83]

Hello -

what do you think of these :



I saw it at jcwhitney.com by navigating as follows :

Car Shop ->
2003 Honda Civic ->
Exterior ->
Spoilers, Wings & Body Styling ->
Rear Spoiler & Wing ->
Carbon Fiber Roof Mount Fins

From what I have read, they are intended for MPG but instead :

"the vortex generator is merely a strip of specially designed fins that are designed to flow more air to the rear spoiler for added downforce."

Soooo, on a coupe, they work in tandem with a giant spoiler :



Do you think they could have MPG applications? If yes, on what kind of car?

CarloSW2