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the hood and roof of a car acts like a wing on an airplane lifting on the car. The faster you go, the more lift you get. On top o that (or underneath actuallY), air is stacking up underneath the car with a high pressure, low velocity airflow.
The splitter on the front is an attempt to keep air out from under the car. The back of the car is left open so the road acts like a pump trying to get air out from under the car. The goal is a low pressure area is built under the car.
So, the roof is lifting the car. any downforce from the splitter offsets the roof lift.
From MPG standpoint, splitter keeps air out from under the car leading to better mpg.
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