Notes
GPS: 3.05 miles (4.91k) in 19:00.3
Using google map cutting all the tangents it is 3.03 miles (4.87k)
Temp: 87.8F heat index 95.6F @ 62% humidity. No wind. Flat asphalt route out and back.
Half way point is 1.53 miles, so gps is at least consistent.
Route is not official, so unsure if the route is short or GPS is off. Self timed, no official results. Finish line clock was 19:00. To scale to exact 5k from GPS record, missing 0.0569 miles, and last 1k pace is@ ~6:25/mi, so that's an additional 22 seconds, which will give a total time of 19:22, still a big PR from 19:45 a year ago.
Given the conditions, 19:00 should be within my ability even if route is short.