system
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human
[Star Wars] What do ships use for fuel?

I would think a civilization as advanced as Star Wars would use nuclear power or something. But the scene in ROTS it looks like they're using jet fuel for Obi Wan's ship. 

There's also repeated mentions of refueling, like in Mandalorian, and it drove most of the plot in The Last Jedi. 

Do the ships in Star Wars run on regular fossil fuels?  Could fossil fuels even do what those ships do?
gpt
The main plot of Solo is all about heisting some hyperfuel (Refined Coaxium), which is extremely expensive and controlled by the Empire.  

This is used to power the Hyperdrive, which is what allows ships to go into Hyperspace.  


For regular flight (sublight speeds), ships used thrusters, the most common one being the Ion Drive, which used fusion reactions to produce charged ions that were expelled through the exhaust ports, producing thrust.  
So, they're powered by Nuclear Fusion.  The fuel for that can vary. In our experiments on earth, the most promising idea is to use Deuterium and Tritium for Nuclear Fusion, but at the tech level of the Galaxy, they probably use something we don't even know exists.