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A working rear wing spoiler decrease lift by adding down force.
If you were to angle the wing so it added lift you would be adding drag by the parachute effect of it. All that flowing air that was clear of the car is now thrown back onto the wing with a drag penalty that is much larger then the rolling resistance elevated.
My take on it, as the lift has such a large drag effect.
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Ride a Mtn bike for errands exercise entertainment and outright fun
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