Wikipedia refers to a definition of jogging as less than 6 miles an hour. So at best a “fast” jog might be 5 mph and an average one, say, 4 mph—hence what I quoted bwing common on the Internet.
I see your logic.
So according to wikipedia, 6 mph is the upper limit for a jog.
I find it difficult to walk faster than 5 mph. At 5 mph, jogging is easier than walking. I would call 4 mph a slow jog, and 6 mph “average” but I am not wikipedia.
Not really very important. But I “jogged” for many years at 7 mph and am now mostly walking about 4 mph.
Hope you did not take offense.