Sorry to disagree, Dale, but that's not entirely true.
What you can't do on many Mobi platforms is display a specific portion of a book in a fixed pitch font - the format supports it, but many Mobi implementations ignore the instruction. It is (I believe) supported by the Windows desktop Mobi reader.
However, all implementations of the Mobi Reader (that I know of) allow you to change the overall font used to display the book to a fixed pitch one - "Courier New", for example, is one of the standard fonts supplied on the Gen3, and selecting this will display a book in fixed pitch.
You could, therefore, temporarily switch the reading font to "Courier" (or whatever other fixed pitched font you prefered) in order to look at a portion of a book for which fixed pitch was vital.
Generally speaking, however, I agree with you - this is probably one case where something like PDF is a better choice of format (and I don't say that very often!)
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