Is it a typo on the Mercury Racing website or do the 377 Scorpions require 92 octane fuel?

I see that the HP500's & the HP525's run on 87 octane.

Could pose a prob at the dock pumps, all I run into is regular.

It is either 91 or 92. Merc used to say 92 for the 575s but has backed it down to 91. Don't know if they have done the same for the 377 or not