What setting do you run your fan on for the all night burn? I never take mine off high.
Depends. My 4100i does not have a set "low" or "high" setting - its a variable rheostat. On very cold nights, I'll have to close to max...avg nights, its usually between 1/2 and 3/4.
Here is an old thread I posted in with some pictures from last season. I've since improved my burn times by using some larger splits and better wood (routinely wake up around 6 to find temps closer to 350). Still gives you a general idea though...
https://www.hearth.com/talk/threads/longest-overnight-burn-tactics.81903/page-2