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Not sure what to make of your question, somewhere your train of thought has gotten off on a side rail and it sounds like you're asking how to pump enough air into the vacuum behind a vehicle to make it "go away".
The fundamental error I see in this is that you are forgetting the air is just sitting there stationary to begin with, a calm day, middle of nowhere, you are ramming your vehicle through it. The air must move out of the way to go around you, how it is returned to being calm again is where we attempt to improve things. This is where the template can be looked at for ideas, since it is the shape that air will follow with the least amount of energy required. Anything else will create more and more turbulence thus requiring more energy....it take energy to make the air swirl about, the more it swirls, the more energy it needed to do that, the energy is seen as higher Cd values and lower MPG's.
You can't really "Add energy" to air to get it to fill a wake and expect efficiency gains from that because it would take a butt load of power to move that much air and the power has to come from the vehicle thus increasing the energy required and dropping the MPG's.
Hope that makes sense.
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