Sorry to disagree, but Calibre DOES impose the Times New Roman font. In fact, just try to convert any FB2 document that does not include any reference to any font, and you'll see that Calibre's EPUB output includes, inside the 'stylesheet.css', the instruction font-family: "Times New Roman", Times, serif;. It includes it several times: always at the .paragraph specification and at some other .calibre# ones.
On the other hand, I've also tried to use the 'extra css configuration' item to control the output font, trying to change, for instance, to font-family: "Verdana", Verdana, sans-serif;, but with no success.
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