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Its completely a block size thing. In LRF for example every chapter is separately compressed. If you follow adobes guidelines and put every chapter into a separate file then I suspect you wont see any significant size differences between LRF and epub.
MOBI on the other hand compresses the entire text sream, but it supports 3 levels of compression
0 - no compression
1 - palmdoc (a lightweight compression scheme)
2 - huffman coding (this should actually outperform DEFLATE for pure text)
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