CMD, as you've seen, probably in "eco" you'll have great range. One thing you might consider: most of the Lithium chemistry batteries in use seem to thrive at 20% - 80% of charge (reportedly that's how Tesla provides and 8 year or whatever warranty). You might consider charging your battery to 80% (four lights) and not letting it go below 20% (one light). This should maximize battery life. If you don't do this, at least keep it above one light.
I'm surprised by the difference in off road riding conditions in MD vs CA. It's raining now here (new record), but usually we can ride 350+ or so days a year (I remember riding 20 days in a row when my kids were at camp and there were no "family" factors prohibiting it).