The PDF Does Not Have The Same Fonts As My Post

You have to remember that the PDF only uses a certain set of fonts and Post Gopher will use these fonts instead of the ones in the post.

HTML and PDF are fundamentally different formats, one is for screen and browsers and the other for print. 

So Post Gopher does its best to translate the HTML to PDF format and sometimes it will not be able to do a straight conversion and then has to make judgments on how best to convert and make it look as close as possible.