We might first acknowledge the data already available on the PFD's of most later glass airplanes; the best L/D ratio is presented on the PFD in the Airbus A320/A330/A340 (and I suspect the A380) series as "Green dot" speed.
Most interesting
This information would be for an undamaged, clean (uncontaminated) wing with different slat-flap configurations but not with landing gear extended or partial slats/flaps (abnormal config).
I guess would not be much of an effort to integrate those factors... Good to know anyway
