This is probably the most complicated and convoluted chase of the entire 007 series. I will try my best to sort it out in chronological order.
With Sanchez's cocaine factory in flames, he escapes in a Maserati Biturbo sedan with his driver and Truman-Lodge. They leave with a convoy of Kenworth tankers and a Jeep full of gunmen. Bouvier and Bond use a golf cart to get to Bouvier's plane.
Bond jumps onto one of the tankers from the plane. He kicks the driver out. The driver lands on the Maserati's hood. The Maserati's driver throws him off the car. The tankers are instructed not to let Bond's tanker pass. As Bond tries to pass one of the tankers, he nearly hits a Toyota pick-up truck coming from the opposite direction.
Bond rams one of the tankers into a mountainside, disabling it. Perez gets out of the Jeep and shoots at Bond's tanker with a shoulder-fired missile. Bond gets on two wheels. The missile misses Bond but hits the previously disabled tanker instead, blowing it up.
Bond's tanker than lands on the Jeep, crushing it. The henchmen from the Jeep shoot out Bond's tanker's tires with machine guns. He comes to a stop, with the trailer portion dangling over a cliff.
Bond releases the trailer portion. It rolls down a hill and hits and blows up another tanker. The explosion causes the Maserati to stop. Sanchez gets out of his car and then kills Truman-Lodge. Sanchez and his driver get in another tanker. Bond gets back in his tractor (sans tanker trailer). The guys from the Jeep get in a Dodge Ram pick-up truck.
Bond's tractor pops a wheelie and drives through the flaming debris of the tanker he hit with his runaway tanker. The Dodge tries to do the same but sets its tires on fire.
Bond sets his tractor on cruise control, gets on his hood, and jumps onto the tanker with Sanchez and his driver in it. The Dodge continues to follow and shoot at Bond. Bond opens the tanker's spigot, sending gasoline out. The Dodge's tire fires, combined with the trail of gas from the tanker, cause the Dodge to explode and go over a cliff, barely missing Bouvier's plane.
Sanchez shoots down Bouvier's plane. She survives. Sanchez's tanker stops suddenly, causing Bond to fall. Sanchez tries to kill Bond with a machete, but ends up cutting the brake line. The tanker moves again, with Bond and Sanchez fighting in the back. The tanker crashes. Bond blows up the tanker and Sanchez. Bouvier picks Bond up in the tractor he had previously abandoned. Whew.