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Why is the mileage of my 735XT so far off compared to my Edge 810s.

I've been noticing that the mileage recorded via my 735XT is much higher than my Edge 810's. Today I went out on a ride and brought my two 810's to compare to my Forerunner. 

  • Edge 810-1 3.80 mi Distance with 919 ft Elevation Gain
  • Edge 810-2 3.94 mi Distance with 961 ft Elevation Gain
  • Forerunner 735XT 5.43 mi Distance with only 771 ft Elevation Gain

Anyone have any ideas what I can check to maybe get things better synced? They used to be much better matched. 

Thanks,

g