Oak up here can be hard to come by, so we do burn what we can. I cut my own firewood, so I can be selective as whenever I am out and about, either camping, motorcycle riding, snowmobiling, once in the habit of checking for brown needles or snags, you are always looking whether you need firewood or not. Seems the oak makes more creosote for me as I have the damper turner down at night and the firebox stuffed full. The White Fir, Red Fir, Douglas Fir, pines I can take the easy to load ones. I always have 3-4 year supply of firewood, just love to see it stacked up out there, money in the bank. I have a mobilehome, so it is easy to get on the roof and clean my own chimney.