Yes, there are going to be different grades of fuel, not so sure there'll be different grades for basic manoeuvring, but the boost fuel will be more compressed or compact than the regular fuel, as will be jump fuel, so those will be more expensive than regular fuel, might take more work to refine, the general manoeuvring fuel is much easier to sort of scoop up around gas giants. We're in the process of sorting out that system now, I'd imagine the boost fuel is most expensive (maybe jump?). There could be a base kind of boost fuel, and a more premium grade fuel that could be rarer from different stars, it's all on the cards. People could make a business out of collecting and refining fuel, it's resource management and it'll be kinda fun. There will probably be the basic kind of fuel, then if you're that kind of guy/girl that likes to tweak their ships they might only use premium fuel for that little bit of a performance increase at a cost.