USR369 requested a way to log recurring routes (gym, Grandma's, Costco) with standard mileage when he forgets to give an odometer reading. TASKGATE matched SOP-HOUSEKEEPING-SCHEDULE.md but content review showed it's about unrelated platform file-sweep cadence - treated as no real match per protocol, wrote a new SOP-STANDARD-MILEAGE.md, added to SOP-INDEX.md, broadcast. Set a 3+ confirmed-sample threshold before a route qualifies as a usable fallback, to avoid estimating off a single lucky data point. Computed actual averages from Daily's full events history: Home<->EOS Redlands qualifies (23mi avg, 5 samples, range 22-25). Montclair (41mi, 2 samples), Costco Highland (17mi, 1 sample), EOS Ontario (41mi, 1 sample) don't meet the bar yet. Grandma's has no isolated sample at all - always combined with an EOS Montclair stop on every trip on file. Standard figures written to knowledge-50.md, will grow as more real readings come in.