Mad Max 2: The Road Warrior

After a global war results in widespread oil shortages and ecocide, civilisation collapses and the world descends into barbarism. Former policeman Max Rockatansky, haunted by the death of his family, drives around the desert Outback of what was once Australia, scavenging for food and petrol with his dog. He outmanoeuvres a group of marauders led by biker Wez using his driving skills and a shotgun. He steals petrol from the wrecked vehicles of one of his pursuers and inspects a wrecked semi-trailer and prime mover.
Later, Max tries collecting an apparently abandoned gyrocopter's fuel, but is ambushed by the pilot. Max overpowers the man with his dog's help, sparing his life in return for being led to a working oil refinery the pilot has discovered. They arrive during the daily attack on the facility by a motorised gang, of which Wez is a member.
The next day, Max witnesses cars leave the besieged compound and get chased down by marauders. He rescues Nathan, the sole survivor of one car, and strikes a deal to return him to the complex in exchange for fuel, but the man dies after Max gets him back, and the leader of the settlers, Pappagallo, says the deal died with Nathan. The settlers are about to confiscate Max's car and cast him out of their compound when the marauders return to negotiate. A feral child who lives in the refinery compound kills Wez's partner with a metal boomerang and Wez wants revenge, but the gang's leader, a masked man called "Lord Humungus", offers to spare the settlers' lives in exchange for their fuel supply and leaves for the day. However, the settlers are divided over whether or not they can trust Humungus.
Max offers his own deal: he will bring them the semi-truck he saw earlier so they can try to haul away their tanker full of oil, if they return his car and give him as much fuel as he can carry. The settlers agree, and that night Max sneaks past the marauders on foot carrying fuel for the truck. He encounters the Gyro Captain and forces him to carry the gasoline to the truck, which he gets started. It is somewhat damaged as Max passes through the marauders' encampment en route to the refinery, but he makes it, followed by the gyrocopter.
Max refuses Pappagallo's entreaty to accompany the settlers to a fabled northern paradise, opting instead to collect his fuel and leave. Wez catches him using Humungus's nitrous oxide-equipped vehicle and causes him to crash. A Marauder kills Max's dog and is about to kill the seriously injured Max when Marauder Toadie attempts to siphon the fuel from the tanks of Max's car, triggering the vehicle to self-destruct. Left for dead, Max is rescued by the Gyro Captain and returned to the compound.
Despite his injuries, Max insists on driving the repaired truck during the escape. His support consists of the Gyro Captain, Pappagallo in a separate vehicle, three of the settlers on the outside of the armoured tanker, and the Feral Kid, who jumps on the truck as it is leaving. The marauders pursue the tanker, allowing the remaining settlers to flee their compound in a caravan of smaller vehicles after rigging the refinery to explode.
Pappagallo and the three settlers are killed and the Gyro Captain is shot down. Max turns the truck around and, as he is fighting with Wez, Humungus collides with the truck head on, killing Wez and himself. The truck rolls off the road and the surviving marauders survey the scene, only to abandon their chase when they see the tanker leaking sand and not gas. As Max carries the Feral Kid from the wrecked tanker, he inspects the sand pouring out. The Gyro Captain drives up and the two share a grin as Max realises the tanker was a diversion the whole time. They rendezvous with the settlers, who transported the fuel in oil drums inside their vehicles.
The Gyro Captain succeeds Pappagallo as leader of the settlers and takes them north. The grown Feral Kid, "Chief of the Great Northern Tribe," reveals in voice-over that he never saw "the Road Warrior" again.