Originally Posted by dwig
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
Just for the info, I reconverted ( ePub>MOBI ) this GIF heavy book again, this time using 0.8.43 and checking the new option to not convert images. The result is a much smaller book, 702k vs 0.8.42's 1853k.