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The details you posted are confusing. You don't say which Oasis model you have and available space will never exceed capacity, which suggests that some labels or numbers may have been transposed. Capacity is the total space e.g. 4GB for the original Oasis and 8 or 32GB for later models. Not all of that space is available to the user because the system files also reside there.
My best guess at what you may have seen is that you have an Oasis 2 with 2.97GB of free space and another 0.40G of files of purgeable space for a theoretical total of 3.37GB available user space.
One wouldn't normally worry about purgeable space. Those are files that the system considers expendable and it will purge them if the system needs that space. If you really want to free up that space, then see if a restart (reboot) frees up space. The definitive way to clear all of that space would be a factory reset (not recommended) which will clear a lot of things, including your books & affect any jailbreak that you may have.
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