I made some calculations over here and if I made them correctly the text is compressed to 17.687 bytes (42.4%) of the original text size on the ZIL version of Craverly Heights. The z5 version are 47.464 bytes and if I compress it with LZW (zip) the file is compressed to 32.371 bytes. That would be some kind of theoretical lower limit. My guess would be that you could cram out maybe 4-5 kB more with a optimal compression but the real time decompression on a 8-bit computer is a challenge.
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