Scrappy Chemistry

Exausted, the engineer finally completes the construction of their oil refinery, the long pipe from the pools of crude oil ready to go. They flip the switch and... something's off. They glance at the notes from "Baby's First Oil Processing Facility" they wrote on their sleeve. It definitely said ~2:1... oh, they forgot about the asterisk. What the hells does "sour gas" mean?

Mechanics

• I'll add more to this soon, but new things are: Butane (gas), Sour gas (gas), Tar (item)