If there is any "ran" in the P-51's tactics the BnZ is going to be entirely based on either the Bf109 pilot messing up or the P-51 pilot making a hard shot as the running P-51 won't be draining the E from the Bf109 due to excessive timidity.
This is what I am getting at... I think some people believe that BnZ and "running" are synonymous... perhaps hearkening from the days of "Run, Stang!" calls attempting to shorten a fight by making a decent BnZ'r do something stupid.... now evolved into "OMG, ITS A PONYD AND ITS FAST = RUNNING".
As far as E-conservation/regeneration, in relation to an opponent now extending away after a BnZ run, what's the best "next move" in a 109-F4? Climb toward opponent, maintain course and build speed?