Just putting this here for posterity, settling a subject of much debate (mostly in my mind). Years ago a friend (also a PhD engineer) calibrated his bike computer and measured it at 4.57 miles. That should have been the end of it. My Garmin 310XT would give me 4.49 +/- and the stupid FR 410 would give me like 4.3. Anyway, I ran it on Saturday with my new 255S in multi-band mode and got 4.56, so I'm going with 4.57.
Also makes my long ago, ill-advised 6-lapper at Burke Lake = 27.42 miles.
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