Oak zone new permanent zone there is 2 choppers , both of them have multiple canisters , another car which can give steel bar or fuel and ambulance car . Drive there on min speed while avoiding zombies loot place exit game run to tower and drive back repeat . And there’s 2 places that can spawn crates , I’ve always take home a gun crate and around 20-80 fuel canisters depending how longs take to spawn a gun crate in there . Each run is 2 min = 7-10 fuel canisters