varmintterror- If weight is not so much of a factor on a race horse, why is 7-8 pounds considered a handicap, and why are there handicappers/handicaps on some races? Don't know where you are in KS, but if you get out towards the western part of the state let me know and we'll try to get together.
Back to the OP though, there are some other variables to consider also on coyote speed like ground conditions and how much roadrunner ol' wile E. is packing in his belly. I can't remember all of the coyotes I have shot, BUT, I am pretty sure I remember all of the running coyotes I have shot. Seeing a coyote running all out go into a cartwheeling, tumbling, dust cloud raising, sliding stop is a very satisfying feeling. There are so many variables to consider; speed, angle, terrain, cover, that I think that guys who are good at hitting running coyotes have it to more of an art than mathematical figures/science.