> For the complete documentation index, see [llms.txt](https://docs-reborn.cryptomines.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-reborn.cryptomines.app/gameplay/mint/fleets/fuel.md). # Fuel **Fuel** is a necessary material to be able to go on expeditions to the Planets with your fleet, this must be acquired prior to the expedition. The cost of **fuel** will vary depending on the Planet you wish to explore, the farther away the Planet is, the **more fuel** will be needed by your fleet to go explore it, the approximate value of fuel is **10%** of the reward of that Planet. All fuel costs are calculated with the Planet's base rewards, meaning, fuel cost will not increase as you level up. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs-reborn.cryptomines.app/gameplay/mint/fleets/fuel.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.