Ashful
Minister of Fire
Doug Fir: 17.4 MBTU/cord (baseline)
Red Oak: 22.1 MBTU/cord (27% higher than DF)
DF is 23.5 - 26.6 mBTU/cord, black oak (Quercus kelloggii) is 25.8 - 27.4 mBTU/cord.
(broken link removed to http://www.consumerenergycenter.org/home/heating_cooling/firewood.html)
I've not used doug fir in cord wood form, but I've laid miles of it as flooring, there is simply NO WAY it is higher than red oak in BTU content.
(broken link removed to http://chimneysweeponline.com/howood.htm)
Here's another way of looking at it, as we all know the old adage, "dry weight is BTU's." Doug Fir = 33 lb/cu.ft. Red Oak = 45 lb/cu.ft. Both dry and seasoned.
http://www.engineeringtoolbox.com/wood-density-d_40.html