On San Andreas Speedruns, why do players blow up the Picador in the mission Ryder?
Solution 1:
This video shows it pretty good:
At some point during that mission, a cut scene plays. If you don't blow up the car, you can't skip that scene and you need to wait for it to play fully. But if you blew up the car, you are able to skip that cutscene which saves enough time to be worth it.
This works, because after failing any mission you are able to skip the cutscenes in that mission, so you don't have to watch cutscenes multiple times.
Credit @JPhi1618 for reminding me to add the actual reason this works