A fresh coyote, flat-out upper 30's-low 40's. Yrs ago Dad had a female greyhound catch dog[Brownie]. She would top out right @ 50mph for a city block or so. Then slow down to mid-upper 40's.
A fast loper, I figure is doing around 20.
One day, she & a group of other sighthounds. Were dumped close range, on a fresh coyote. Coyote was on the large size. Main group of sighthounds was a little ways behind the coyote. They all were running flat-out. Female greyhound[Brownie] passed up through the group & was gaining on the coyote.
She's near catching him, all of a sudden that coyote had abit more speed & pulled away from her. We were awestruck @ his speed. As the coyote had to be doing over 50.