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Agreed about the trailing wake not being 100% of frontal area I'd estimate for most cars it is still about 80% of frontal area though, so lets use a 25 SF frontal area example.
25 SF * 5280 * 0.80 = 105,600 CFM
Since we want to cruise (60 MPH to match above) at a low RPM for FE lets say 2,500 RPM and a fairly average size motor 2.0L (0.0706 CF) we get an exhaust output of roughly 88 CFM so the turbo would have to add 1200% more CFM for 100% fill, I don't think that's even close to being possible.
Considering 100% fill is probably not necessary for a sizable FE gain probably still wouldn't get us anywhere near reality, even at 50% it's still 600% more than engine exhaust needed from the compressor side of the turbo.
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