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Hi,
I don't think the Venturi affect applies here -- that would be for when the air is in motion and the object is stationary. This is the object is in motion through the air -- and like an airfoil wing, with a flat bottom and a longer air path over the top, you get an increase in pressure under and a decrease in pressure above the vehicle = lift.
The slope up to the rear decreases pressure (because there is greater volume for the air to be in), and this would produce some small bit of downforce -- or at least less lift.
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