80-90 mpw
1:57
4:08
8:46
Typical training pace for road runs was 6:20-6:40 pace although I would do one longer run a week (10-15 miles) at 5:40-6:00 pace.
All other quality was either races or Interval ladder sessions of 400-1600 meters.
I don't think there is much correlation between training pace and PRs. In college I recall training with many runners who hardly ever ran slower than 6:00 pace on recovery runs and I usually never ran faster than 6:20 pace until the last mile or two.
Brad Schlapak was a sub 4 miler who also won a national Cross title and ran his recovery runs at 8:00 pace.
I don't believe that there is any added benefit to your training by making sure you jog your easy runs. That is what my college used to preach to make sure guys weren't running too hard for those runs.
I think everyone depending on their current fitness should be always focusing on the pace that is just under what they would feel the need to concentrate on holding that pace for recovery mileage. It should be the fastest pace they can run that feels effortless.
At least that is my opinion.