Just for fun I did an experiment with Lysistrata. I took the same source ePub that I had fed to calibre for conversion to MOBI and fed it to Kindle Previewer 2 (aka Fire Previewer) so that its KindleGen2 engine would create a KF8 MOBI. These result was smaller than calibre's:
ePub source = 632k
calbre's MOBI = 1853k
KindleGen2 MOBI = 1404k
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