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Unfortunately, no sign of tapering off, at least not yet. I have been on a continual decline for about 1.5 years now, losing about 13 miles in that time. Which is strange, because for 2 years before that, it was basically flat. Not sure what it means, but I'm starting to get a little concerned about it now.
Maybe I should try a 0% to 100% charge, something i have never done yet. I usually just charge to 80%.