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There is roughly 33 million BTU's in a tank of oil (250 gal tank) and 23 million BTU's in a cord of wood (hard maple). Four tanks of oil should roughly equal 6 cords of wood. Of course it rarely does - Oil furnaces are usually a lot more efficient, there are no line losses transmitting heat from boiler to house, many of us keep our houses warmer when we use an OWB, often we heat other buildings with our OWB etc. etc.
my wood usage money will never be spent on an IED
A cord is a legal unit measure and is 4' x 4' x 8'.No others should be used as there is no fixed size to them. (ie: a face cord is 8' long and 4' high but has no fixed width even though most common is 18")