I was surprised because the KF8 file I have put on my Kindle Touch 3G cannot be read. I have called Amazon and after some checking they told me the new KF8 format is designed for bigger screens, and the Touch cannot read them.
So I'll have to take either the KF7 version or the combined KF7/KF8 one, if I manage to make the kindlegensrc thing to work
Edit: in fact after some testing it seems the touch really does support KF8. It is good because some ePub format requires this, and without this I have a bad formatting.
BUT... I cannot upload a AZW3 file to my personal documents on Amazon, it refuses the extension, it accepts just mobi or AZW... AND... Calibre cannot send AZW3 files to the Kindle, it does not recon it as a valid format...
AND... if I rename the AZW3 file to AZW then the Kindle does not recon it anymore...
SO... I have two choices : either put AZW3 the manual way, through drag'n drop in the Kindle...
OR... keep the mobi file which includes both KF7 and KF8 format, but then without the kindlegen script... and so I have to find out an easy way, such as a wrapper for OS X, to do this
I don't want to have to use command line each time