You need some margin for error to assure that you have enough fuel during the last fuel seconds to hit the marge at a safe speed, this means that there will lik

You need some margin for error to assure that you have enough fuel during the last fuel seconds to hit the marge at a safe speed, this means that there will likely be some fuel left over. In terms of a rocket exploding, that explosion seemed tiny. Compare it to the Antares [1], which exploded just a few seconds after launch. [1] https://www.youtube.com/watch?v=jHMmMgdcOSU https://www.youtube.com/watch?v=jHMmMgdcOSU