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"the C-Class merc takes in fast moving air under the car, and ejects it out of slits in the tail light lenses."
Can you provide a link to this information, because I find it highly unlikely.
First, this, in and of itself, would not reduce the drag coefficient to 0.27. There are plenty of vehicles with Cds in this range and lower that do not employ ducting. Second, stop and consider the losses incurred (not to mention added weight, complexity) of ducting high speed air from the bottom of the car to exhaust vents in the taillights. The added ducting (if it exists) would actually increase vehicle drag.
Perhaps Daimler employed this to reduce the pressure in the rear wheel wells. It seems more plausible- as there is a build-up of pressure in the wheel wells and the shorter, linear distance between the two.
However, a simpler, much more effective (and elegant) solution would be to partially cover the rear wheels.
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