All I know is the books that have maps are perfectly legible (and they aren't even the majority of books, and yes they do tend to be bigger than the average), and at the same time, Amazon books tend to be smaller in size than books sourced elsewhere.
I suppose it does depend on what you read, but honestly... most fiction doesn't have illustrations, and I haven't seen all that many that have images at the start of a chapter whether ebook or pbook.
And I still think 3 MB per book is ridiculous.
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