>>40232733FOB Tokens, you get them every week by doing jack shit, and when you unlock FOB you get like 100k for free.
These automatically give you refined materials (the worst material to farm is fuel so buy fuel).
Secondly do the challenges that give fuel like "Get X amount of vehicles" that are really easy to do.
Thirdly, every 3 missions all of the resources in the game respawn. Do Mission 3, fly in with Pequod and literally lay hell on the enemy, if you do it right you'll kill the colonel and then pequod will auto fly away, entire mission takes 30 seconds from start to finish if done right.
Then after do mission 30 Skull Face. Use the invisibility camo to cheese through until the second gate where the fuel containers are.
Exit mission do NOT restart from checkpoint/restart mission. This will make the fuel less next time you do it.
You get about 10k fuel every pass you do this.
Next, go to code talkers mansion, there is a truck that parks and goes back and forth from there to an outpost. Wait for the truck, hope in the back and go prone and alt tab and wait.
