Determine the Plural of Prius advertising campaign - Prii, Priuses, Prius, Prium, Prien

[Garson O'Toole]

USA Today has an article dated Jan 22, 2011 about a Toyota run poll on
the Prius' Facebook page:

Title: Lots of votes so far to pick plural of Toyota Prius

http://content.usatoday.com/communities/driveon/post/2011/01/big-turnout-to-decide-plural-name-for-toyota-prius/1
Short version:
http://goo.gl/5cERf

Just when you thought you could go awhile without election news, along
comes Toyota with its call for balloting to designate how you say the
plural of the Prius hybrid. So far, 47,000 votes have been cast on
Prius' Facebook page, says spokeswoman Zoe Zeigler. …

And which plural name is most popular so far? Prii seems to be the big
winner so far, with 40% of the ballots cast. It is followed by
Priuses, 27%; Prius, 15%; Prium, 11% and Prien, 8%. ...

But there's still plenty of time to vote. The official winner won't be
announced until Feb. 20 at the Chicago Auto Show. Toyota vows to use
the name in its official news releases in the future on the Prius, er,
Prii, um, Prien.

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