Before I switched to coal the 2 stoves consumed 6 to 8 cords per winter, plus we always had enough oil in the tank to run the furnace when the stoves were low, such as in the morning or when gone all day. We also burned the propane furnace in the kitchen to warm that up. With the 2 coal stoves we are able to heat the house with coal only, burned less then 1 cord of firewood in the living room insert. No propane use, haven't used the furnace since I connected the stoker to the hot air ducts.
Just yesterday I was looking at the woodshed stacked with wood for next year and thinking that a switch to coal in my hand-fired boiler might make life easier for me, as I am in my AARP years. I haven't quite overcome the German instinct in me to use free wood instead of $$$ coal.