Like you, I call BS on that study, Luke :-) When I looked into this I found that double spacing was introduced exactly to compensate for the fixed width monospace typefaces which died spectacularly along with typewriters.

I wrote about my own epiphany, here, how Medium quickly got me to kick my lifelong doublespace habit.

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Editor of No Crime in Rhymin' and Language Lab | the Woke Bloke ..."come for the sarcasm, stay for my soft side"

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