Well, for me, it’s always one – and only one – space after the period.
When you use a fixed-width typeface like this – and as @aliisyourfriend quip’d – the thinking is that it may be important to call out the full-stop end of a sentence to the reader by tossing in an extra space. At least, that’s my understanding. It’s not something I subscribe to.
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Those of you who read a lot on the web might be interested to know that HTML is no respecter of whitespace. I can type as many spaces as I want in the text field, but only one of them shows up in the posted quip.
Like this:
Starting 100 spaces here =>| |<= done. Oh look, only one space appears in the quip.
Seems to me that the web standards committee long ago decided this topic. Now it’s just up to the rest of us to catch up.