Sorry im not sure about the run not run situation as you point out to run means to lift all limbs of the ground I just used the term freely as in to move fast.
Was just addressing the matter of speed itself.
25 mph are the older stats
15 mph around is what they have been clocked at according to recent studies (dont think they managed to just happen to come across the fastest elephant on earth :)
But even the 15 mph thats not far of double the speed of an athlete running the marathon.