I know, for me, it seems as my wood supply gets older it's almost like I'm finding it easier to heat the house. I'm burning 5-6 year old red oak mostly right now. As time goes by that wood I burn will be getting older though, up to about 10-12 years old. I just need to stop putting up more wood than I burn every year.
Also for me, burn times and if I load on coals or not and on how many coals I load on depends on the outside temps and what the inside temp is. Burn times are hard to quantify though, as they can vary by a couple hours depending on what state of coals one loads on.....or even more if you happen to find a few buried embers in which one can do a matchless relight with and include that time as "burn time". I don't have any issues loading a 40-45lb load at night and still having plenty of coals to load on 10.5 hours later in order to just load and go. The blower still running. 40-45 lbs is probably about 2/3rds full. I can do about 60-65lbs of good red oak in a full firebox. Now in colder weather I will be loading sooner on more coals or loading more wood the night before. I have done as long as a 21.5 hour "burn time" on almost 100lbs of Black locust in the past.
I decided to buy a -GATEWAY- for my Thermoworks Smoke which I use to monitor my supply and stack temps. This sends temps to the cloud every minute or so and allows one to export the data to a CSV file to play with in a spreadsheet. Supply temps are taken in the plenum, but the HVAC probe I...
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I think most of you already know what I'm heating. It's not very efficient and I lose a bunch of heat out the peak....which I have posted photos of in the past. In real cold weather there will also be some frost buildup on some corners in a couple rooms. Before I was in the picture, she kept the house at 68° all the time and averaged 1,300 gallons of LP a year from 2005 through 2009 (max of 1,500 gallons in 2008). This was NOT heating the basement. ~125 gallons of that went to the water heater and dryer a year (based on my records), using an average of 1,175 gallons of LP in a 92% efficient LP furnace equates to about using 4.9 cord of red oak in an 82% efficient wood furnace. Over the past 5 years since I've had the Kuuma and kept records, I have burned an average of 4.5 cords a year. House is kept between 70° and 74° and the basement IS heated by way of radiant off the Kuuma. So I'm heating more area to a warmer temp.
As far as usage this winter so far:
October: 705 HDD's, 0.28 cord, averaged 33.5 lbs wood used per day
November: 755 HDD's, 0.34 cord, averaged 41.2 lbs wood used per day
December: 1,262 HDD's, 0.72 cord, averaged 85.2 lbs wood used per day
I'm using 3,650 lbs/cord for red oak. I'm in the process of checking this, and of right now I used 0.67 cord by way of physically measuring the row. This same row came out to be 0.62 cord by way of weight....159 lbs short. I have another 1 3/4 cords to go though, so we'll see where I am at once it all gets burned. A couple years I checked it and 3,650 was pretty much right on. I'm guessing I'm going to have to lower it some now due to how old the wood is with less moisture in it. I'd think by now it has reached equilibrium state though and will just fluctuate from here on out based on weather conditions.
This will make a difference in extending blower run time. It decreases BTU output/hour, but it also extends it's runtime for more efficient handling of the coals. I should really be taking advantage of that too more than I do. If I am down there at that time and think of it, I will turn the computer off. I just don't make it a point nor do I have it setup to do it automatically like you do. 
) then its back to factory settings...in the meantime, this new setup is saving me lots of matches, and some time. 
