Towards the end of World War 2, the Japanese began to use pine oil from pine tree roots to fuel their airplanes. Heating the roots and distilling the pine oil took 12 hours and only resulted in ~4 percent crude fuel. – WTF Fun Facts
Source: https://books.google.co.uk/books?id=_fSaDwAAQBAJ&pg=PA258&lpg=PA258&dq=pine+tree+sap+japan+airplanes+ww2&source=bl&ots=A4mzEMlgAt&sig=ACfU3U1_WZom0qKd86pF_ZJcoGmFy8nzfw&hl=en&sa=X&ved=2ahUKEwj67OHlvoPnAhUBTBUIHbWUDfMQ6AEwGHoECAcQAQ#v=onepage&q=pine%20tree%20sap%20japan%20airplanes%20ww2&f=false
WTF Fun Fact – Pine Roots For Jet Fuel
