Lesson learned. Small fires don't pay off. It's getting cool in the evenings here but warm during the day. I decided I would start a small fire just to last the night. Put 3 splits on at 8pm. Woke up at 5 and just had coals, house was 71 (wife likes it warmer). Put another split on and went back to sleep. Woke up at 7, that split was still going, house was 71, but the cat was barely active. I just put 2 more splits on to get the cat well into the active range. If I would've put 6 splits on lastnight, I would have gotten at least 18 hours out of it.