Note
Some more snow overnight, and ski conditions were really good. I decided to spend all my time up top skiing, and passed on running, and did ski intervals instead--the last of which took me right up to dusk, which was early because of overcast skies and developing fog.
And besides the really nice skiing, I got very lucky as well. Over the past few days, it had seemed like my truck was cranking more slowly than usual, and when I got back to the parking lot after nightfall and went to start my truck, it just *barely* turned over enough to start. Driving home it was fine and completely normal, but it was clear something had to be wrong--and not the battery, because I have a new battery. So once I got safely back home and in my garage, it turned off the engine, and then tried to re-start it: nothing. My diagnosis (re: guess) is the starter has failed. Very happy that it didn't fail in the parking lot, while the fact it has failed doesn't bother me at all--this was the original starter, now 25 years old!