system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What kind of fuel goes into Star-Ships anyways? Is it expensive?

This is a question that I've always wondered. What do I need to fuel my star-fighter? Do I need different fuel to go to Light-Speed? Do different ships have different parsecs-per-gallon? If so, what ships are most efficient in this way? How expensive is this fuel? Is it a major expense for a professional ~~trucker~~ smuggler like Han Solo?
gpt
There are a number of different fuel types common in the Galaxy, ranging from exotic reactive compounds to tachionic matter found in hyperspace to 'plasma' that gets mined on planets such as naboo. 

It's not specified anywhere I've seen what fuel costs are, but by virtue of being an economy that the Intergalactic Banking Clan had interest in, it is clearly profitable. Conversely, given how common personal spacecraft are, it's clearly not a prohibitive expense.