So today, as you can see, my battery went from way high to quickly low in 3 hours of web surfing with some Teams activity. It appears Honey (the safari extension) might be the culprit -- it was chewing a ton of CPU time and keeping Safari jacked up. I've disabled it and I'll see if it was actually the reason, but I do expect my M1 to get more than 4 hours of light use. Geez.