Isnt the real issue the limitations of the mechanical components of the aircraft. I am sure that the top speeds given in many texts are not entirely accurate. If an F-15 pilot chose to fly his aircraft at full afterburner until he ran out of fuel, doesnt he risk engine overspeed or oil pressure problems??
Case and point:
I use to work on CH-53's. Many publications say that the CH-53 can fly at 200+ KIAS (and it can do faster), however the last NATOPS that came out instructed pilots not to fly over 180 KIAS mostly likely due to the fact that failures of components are more likely when flown at top speed. I also know that if a pilot were to "pull" to much collective, he can easly overspeed the engines and over tourqe driveshafts and gearboxes.
So its highly likely that the F-15C can fly faster that publications say, but how fast before stuff breaks??