You guys are right - I was looking at the .pdf that I downloaded from the UK site (same that Yodie_765RS quoted above).But r00t is in Atlanta. The manual for the RS says, "These Triumph motorcycles are designed to run on unleaded gasoline with a CLC or AKI octane rating (R+M)/2 of 87 or higher." -Page 94 r00t, are you reading from a non-US manual? If you're in Atlanta and you can get ethanol free 87, I'd definitely go that route.
Then I checked the paper one which came with the bike and it has exactly what beatle quoted.
So I can safely run on ethanol-free at either 87(QT) or 90(Shell).
Thank you for clarifying!