Loss of Bytes when saved as JPEG

After editing my image and flatten my layers I save my image as a JPEG I have everything I can think of set to the highest/maximum yet I seem to be losing so many bytes making my images pixelated when printed. For example my RAW files are 15mbytes yet once saved as a JPEG i'm lucky to get just over 1mbytes!

File size is not the same as image size. Don't get them mixed up. The reduced file size on disk is because of file compression - not the same as fewer pixels.
The jpeg compression algorithm is incredibly effective. A 250 MB tiff may save out as a 2-6 MB jpeg, depending on compression level and content (fine detail is less compressible), and with little immediate visual degradation. Then it's decompressed when reopened.
However: The degradation is cumulative and non-reversible - so every time a jpeg is resaved it's eaten up a bit, and after 10 to 20 saves or so it's mush and the file is irreversibly destroyed. That's why you should never, but never, use jpeg as a working format - only as a final delivery format to save bandwidth, saved out exactly once.

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