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Originally Posted by MGB=MPG
theory is that it directs smooth air from top side to fill *the Vacuum * of the big hole i punch in the air.. thus reducing drag..
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But it does so at the cost of increasing drag & area.
These things can work, but in order to do so, they need to be far more elaborately shaped than this crude contraption.
Spoiler Alert: Minivans and SUVs Could Become More Fuel Efficient : TreeHugger
"It should be emphasized how different this spoiler is from those we're accustomed to seeing on performance cars, and the small ones already installed on some SUVs and minivans"
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Whats your evaluation of that old top duct on the ford ??
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Most likely working against you.
Remove it and see what difference it makes.