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Grammar question: Plural of Model S?

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From the Chicago Manual of Style:

7.61 Plurals of letters
As an aid to legibility (compare “two as in llama” with “two a’s in llama”), the plural of single lowercase letters is formed by adding an apostrophe before the s. The s is roman even when the letter is italic. Capital letters, however, do not normally require an apostrophe in the plural. To prevent misreading, avoid beginning a sentence with the plural of “A” or “I.” See also 7.14.

There really are two x’s in Foxx.
the three Rs

So, "My wife and I love the new Tesla vehicle so much that we've ordered two Model Ss. Since our kids are grown up, though, I don't see any Model Xs in our future."
 
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I run into that situation a lot when I post the newswires to the evdl.org.
I cheat ... I tack EV onto the end, and make that plural.

She bought one Tesla Model S EV.
They bought two Tesla Model X EVs.


{brucedp.150m.com}
 
As did Toyota: Prius, Prii.

(Making you wonder whether these sentences are also correct:
"My Prii engine is very quiet."
"Everyone get into to the Prio!"
"I just bought a Prium.")

D'oh! You beat me to it. I was going to say that the plural of the Model S is the Model I. (for the same reason)

Person 1: I just saw a couple Model I drove by.

Person 2: Yeah. The Model S in front was a pretty shade of blue.