Great to hear and thanks for sharing this info. I suspect the dealer isn't doing anything to check degradation. I could be wrong given how clueless most dealerships are about EVs. Even Tesla doesn't do anything about it until you complain about it. So hopefully your aren't experiencing any degradation.I've personally never worried about stopping a charge before 100%. I just got my 20k service done, and the dealer diagnostics didn't reveal any problems with the RESS or the original 12v battery. I fast charge constantly while on the road, then use level 2 the vast majority of the time just because it's while I'm at home of staying somewhere overnight. While slow charging, I almost always charge up to 100% just so I have a full tank when I'm ready to go out again. I never let the bike sit for more than a few days without riding, but also regularly run it down to 5% or less. I've never noticed any degradation of the range since I've had the bike. Just my experience.
One thing I am mindful of is always unplugging the bike after it reaches 100%, or at least when I get up in the morning. Not for any reason other than my own OCD.
From what I've seen it might be hard to do given how the display shows range in that it seems to take into account how you last rode it. If you pretty much ride the same way and route, like commuting all the time, it might be a lot easier to tell. I would think though after 20k miles you should be able to determine if there is any significant degradation but some people are oblivious to these things or conceptually aren't aware. You seem to have a handle on that.
Given that HD allows up to 20% degradation before it invokes a warranty claim that is a lot of latitude for degradation. Tesla allows for 30% but over 8 years. A 20% on the ELW would be really bad.
@Bob_B - if you don't mind sharing, where do you live? Trying to understand if your bike is operated frequently in temps over 90F. Also good to hear about L2 charging. That was my plan and it looks like it can make for a more consistent and faster charge which to me is the biggest drawback of the ELW; its pathetic L2 charging rate.
My hope is HD actually put some thought into the charge levels so that in reality at we are only at about 80-85% actual charge state of the battery and shows 100% on the display. I also hope there is some buffer on the low end as well. This will really help with the longevity of the pack. They still screwed on the L2 charging and it seems L1 is even worse that I thought but L2 might actually get you to the rate where L1 should have been in the first place. So this has pretty much put the thought to rest of even bothering to use L1 at home. I'll just leave the charge with the bike and use my L2 connection instead. I'll add a fan to blow on the bike to help it cool while charging to allow for the quickest possible charges.