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I'll be doing some ABA testing with delta VGs on my Aspire when the weather clears up. Tuft testing shows good straight flow on the rear window, but I haven't noticed a reduction in drag.
The simple version of the VG discussion is that they're not very effective for reducing drag. They do lower the Cd by a small ammount (6 points on an Evo), but other mods such as a Kammback will get you far greater results. VGs do have their applications, but there are simply better choices in terms of drag reduction.
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