It seems likely that Data storage size has some correlation with the size of one’s Library. As of now, I have 1713 Books and 245 Docs, plus about 300 Newstand issues. All of these things require some storage even if they are not on the device (thumbnails and metadata). Still, it cannot account for the storage that is getting allocated (and seemingly never decreases in size).
On the iPad I’m typing on, the Kindle app size is 115.7 MB and Documents & Data is 118.8 MB. I have 3 books downloaded, which account for something like 80 MB of that (sheet music and illustration-laden). When I remove books, the D&D total goes down. On my iPhone the Kindle app chews up 5.6 GB of D&D but that includes 3 dozen audiobooks.
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