Gonna need that gasoline.
How to Get Resources – Ghost Recon Wildlands
To be able to acquire new abilities, or upgrade current ones, for your character in Ghost Recon Wildlands, players need to get a hold of a number of resources such as gasoline or medical supplies scattered around the map. And while small amounts of these resources can easily be found hidden inside enemy outposts, they are other ways to get resources in large quantities.
The first of these methods is to hijack convoys that can occasionally be seen making their way across the map. Simply ram into the armored trucks in the center of these convoys, or take out the drivers to stop them in their tracks. You can then proceed to tag them for your rebel friends, and gain a large amount of these supplies for yourself. Bear in mind that these convoys are also usually accompanied by many enemies, making them a lot harder to deal with.
Another method is to interrogate high ranking members of the Santa Blanca Drug Cartel and get them to reveal positions of valuable assets located in your surroundings. You can then go ahead and steal these to give to your allies, and gain massive returns in the form of various resources.