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Gotta see some pics Tas! Or did I just miss your thread?
HypeNoob, that question is hard to answer. But at $20 for the set of VGs, I only need to improve my FE by 0.2 mpg, or 0.5% if I drive another 80k miles with them on. So it seems plausible that they could pay off. But since I may never really answer the question of whether they are even beneficial in the first place, who knows.
Conn, good question. I am picturing attached flow over the roof edge and down the glass at the edges "buffering" against the vortices, so to speak. But I think we all know how terrible most people's aerodynamic imagination is....
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