This video looks at pressures and areas, and takes into account what is happening at the front of the car as well as the back.
We generally think of the rear of the car as being more important than the front when it comes to drag, but I wonder how much of that is a carryover from older-shape cars that had a lot of rear separation (eg from the trailing edge of the roof on sedans / notchbacks).
This video deliberately tries to keep things simple so doesn't look at trailing vortex drag, undercar drag or friction drag. Note that the diagram below is not showing pressures but actually the drag/ thrust caused by each area of the car.
The video was in part prompted by Vman455's measurements on his Prius, and also a comment I got on my channel that questioned how much drag was actually being caused on this Hyundai by the low pressure wake: