Another article mentions the fuel gets heaver as it burns. So if it was used in a ship it'll get lower in the voyage as you travel. Personally I'm waiting for

Another article mentions the fuel gets heaver as it burns. So if it was used in a ship it'll get lower in the voyage as you travel. Personally I'm waiting for thunderf00t on this one. (But it's also cool to do strange stuff to brew beer, the story is an important part of the drinking, allegedly)