This is an example of the ‘work’ on the SFX/VFX MA course at british the National Film and Television School, this burnt-out wreckage was the climax of their first-year pyrotechnics course.
They used a total of 15 litres of petrol, vaporised and ignited by a few lengths of detonation cord to engulf the unfortunate Saab 9-3 Convertible (incorrectly stated Saab 9-5) in glorious, beautiful flames. The slow-motion footage reveals the complexity of the fireball and the sheer force of the explosion smashing, burning and ripping parts of the car clean off the chassis.
The footage was filmed on a Phantom FLEX camera at 2570 frames per second, although the majority of the explosion is sped up in this video, as the entire explosion lasts over 6 minutes when played at original speed: