Where did fuel come from during World War II?
Here’s some articles on the subject. For example most airplanes had reciprocating engines that used a high octane rated gas. Now most of today’s jet engines use a refined kind of kerosene.
There are many more links on this subject, too.
Now my question today is more about our future. Where will the fuel come from if times should get hard? I looked to the past mostly as a method to better form my own opinion.