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1. Get jpegtran.exe from http://jpegclub.org/jpegtran/ (beside Windows binary compilation, just above the header for section 2).

2. Put it in your path (e.g. C:\Windows\system32).

3. Open notepad, copy the following lines into it, and save it as squish.bat on your desktop or somewhere.

 

cd %1

for /r %%i in (*.jpg) do jpegtran.exe -progressive -greyscale -copy none "%%i" "%%i"

for /r %%i in (*.jpeg) do jpegtran.exe -progressive -copy none "%%i" "%%i"

 

4. Give color images the .jpeg extension (since the script above turns .jpg JPGs into greyscale JPGs and leaves .jpeg JPGs alone).

4a. If you like, you can just delete the -greyscale above and not bother with renaming your color images, but you'll lose a little bit of savings (~1.5 MB in Eve to Love book).

5. Drop the folder with all the images onto the batch file.

 

I unzipped your Eve to Love release to its own folder, dropped it onto the batch file, and rezipped it using zip/store (no compression).  It went from 203 MB to 184 MB, which may not sound like much of a reduction, but that's 10% more downloads before your allotment is used up.