Thanks for your input!
I've learnt loads about the initial refinery process to get fuel from crude oil. It was just for a chemistry assignment, but now I'm really interested in it!
I'm learning about what happens after the refinery process. There's a lot more things you can do to the fuel, so to alter its flashpoint and make it lighter, etc.
I assume that the different types of fuels are generally named for those kinds of properties, but I'm still not sure of the different catalouges used.
I'm also still not sure what an octane is. Does it have something to do with the number of hydrocarbons?