sorry, but as a stat person, this list is highly inaccurate (and also means I run faster than Fox, and although I didn't do mph tests, I find this extremely funny >_> ). Sonic is way more than 21:26 speed ratio faster than falcon, and falcon and fox aren't that far apart either. Just by looking at that, I can tell this is highly inaccurate. ZSS also has a slightly faster top speed in running than Sheik does, but if you don't look really closely or do it over longer distances, it's harder to notice. Nice try though.
want a truely accurate list (to extremely high accuracy at least)?
go to bridge of elden, count from the first 1st frame of your dash, and then record the frame you die on the side of the stage. This would be extremely hard to test using my old melee methods, but using good recording equipment that goes at 60fps we can get a highly accurate speed list. Also, acceleration would be a factor, and I will rank players by top speeds, but the list can give you a good idea of how fast they run. If you want acceleration to be a bigger factor, use one of the spawn points near the edge of bridge of elden. The farther you run, the less acceleration will be a factor on average.
Also I'm doing a walking speed list soon, and then ill do running, then combine them, then do other stuff in the near future.