Now. I am a mechanic by trade. I think that qualifies me to point out chainsaws use a gasoline oil mixture to run (sarcasm). There is a chainsaw present in the picture. There are no gas stations nearby in the forest. Its pretty typical for forest services to backpack gasoline into the wilderness when operating chainsaws. While it could be used to fuel a fire this isnt proof of anything. You dont need gasoline to start a raging brush fire.