I use Oak as my primary fuel, and Hickory chunks for extra flavor. Of course, I'm a "log burner", and don't use propane.
Last year, I was out running the backroads heading to a local lake when I saw a large oak tree that had come down the night before in a storm. County road crews were busy cutting the trunk and branches into managable pieces to clear the road. I came back a couple hours later, and put as much of the wood as I could lift into my van, brought it home, and cut it into logs and split those into firewood.
Peace, Love, and Vegetable Rights!
Eat Meat and Save the Plants!