Moment of truth this morning. Ran into work with the Garmin and measured the distance. I'd previously plotted it on GMap at just over 13km (http://www.gmap-pedometer.com/?r=206274) and the Garmin has been almost identical to GMaps so was expecting something similar.
Started off at a good pace and was aiming to maintain 4:10kms all the way. Struggled with all the hills in the first half getting to Spit Juntion (5.91km) in 25:18 - 4:16 per km. I usually reach Spit Junction in 27-28mins so this was pretty quick. Picked up the pace along Military Road, struggled over the bridge and got to work in 53:22. Probably my quickest run to/from work that was not run as a tempo session. However, the Garmin said it was only 12.73km(!) meaning an average pace of 4:12 p/km. It might have lost a bit in the undercover steps that go back and forth on each other at the end of the Harbour Bridge but not 300m. I think I'll stick with the GMap calculation for now...
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