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Hey, thanks for the great discussion!
On the silver truck you show, the little vents up high are just to let underhood heat out when you shut the truck off - they are up high so the hot air can get out from under the hood. The VAST majority of air goes out underneath the truck.
As an example, look at the height of the front bumper. It is MUCH lower then the frame rails - the front bumper pushes air around the truck giving the underhood air a place to exit out under the truck.
On the fender. Look at the front fender of the silver truck. Air is going to go around the front tire, and stack up on the inside of the fender just in front of the step.
The skirt on the ferriari is for visual mostly, and to let a bit of air out from under the front of the car. On a Ferrari, they are tubbed, so air doesn't have a great way to get out teh front of the car.
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