Quote:
Originally Posted by aerohead
It is only clear in the context of the specific vehicle investigated (Mitsubishi Lancer?)
Since VGs were intended for notchback type cars,the caveat to VGs would be,if you have a notchback car very much like the Lancer,then there is an opportunity to see a very small drag reduction with the addition of properly-sized and positioned VGs.
No broad and sweeping claims can be made to the otherwise.
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I agree with you that VGs are not a magic item which gives you higher MPG by just having them, and use of them should be looked in context. What I specifically refer to is that VGs when used properly can help to increase efficiency of properly designed spoilers by increasing speed of flow and decreasing spoiler stall speed.
If not used properly they will do nothing or hurt, but this can be said of any aero mod.
Edit: not sure which vehicle they used. There are more production cars/SUVs use them now. I followed hybrid Avalon last night it had OEM VGs on rear underpan.