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Aside from my supra I've got a 4runner, I was wondering if anyone has had any eperience with those spoilers that mount on the back of SUV's and channel air down over the rear window... Since the back of these things are so big they would create a vaccume behind the car and I was wondering if one of these spoilers would do anything for my milage by cutting down on the turbulance and the vaccume behind my 4runner? Any ideas?