What can I use for fuel?

There are 2 kinds of fuel, one is for powering up your facilities, and the other are for vehicles. When you create facilities such as a bonfire, you'll need to use fuel to run it. There are different fuel sources available such as logs and coal.

Logs can be obtained in the field, you can also chop down trees as well to gain them. In order to make Coal, you can use Pine Logs or Pine Planks as materials, then turn it to coal. Just use the Bonfire to do it.

The fuel used for vehicles on the other hand, requires you to fix the oil machine in the Oil Rig area.