The Jericho Mile.
Another great place to KoM hunt are popular hiking trails at altitude that aren't popular with ultra crew
Example, Yosemite valley, lace up, no pack, start on JMT or PCT near tuolumne meadows, pick a segment, shout "gobble gobble gobble gobble m'fer" and just blast to the Lyell fork bridge or whatever at suicide pace.
Oh damnit #6 out of 88,500
Still not bad tho. Even easier is to tempo the return when all the hikers are slow.
That's my KoM baby, 6:20 pace, mostly downhill