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I have given a LOT of thought about this lately.
I don't think it is a simple solution.
The high pressure at the front of the car doesn't really cost energy in the long run. What costs energy is the turbulence or size of the rear of the car.
So, the channel has to be BIG to be effective. and if the channel can be big, why not just make the frontal area smaller?
I think there are easier, simpler benefits with just rearrange the tail - make it taper. You get most of the benefits with almost none of the hassle.
However, I really invite discussion - I think this is MOST of the mileage gains to be found.
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