Our Van Wert is about the same as the EFM's and it uses about a 1 ton for 3 months in the summer which is used for hot water. 10 tons a year for nearly 4000 sq. foot home.
To put the oil in perspective 1 ton of coal is equal to about 180 gallons of oil, as far as the wood its about 1.4 cords if I rememebr correctly but don't quote me on that. Rough guess is you would need about 5 tons to meet your current heating needs but that will include domestic hot water if you get the coil. Maybe 6 especially if burn year round. Is the coil even optional on the EFM's? I don't know....
See here for fuel coast calcualtor to get better idea: FUEL COST CALCULATOR!!!
If you're getting wood for $100 a cord that will be far cheaper than anything you get, is that cut and split though? A coal boiler isn't going to require more than few minutes each day to operate it during the coldest days of the year. When you get temps like this probably once a week.