Our bikes came out before the major changes to gasoline so they are sensitive to these changes. When I owned my 450 I used 93 premium and always added Sta-Bil. My W650 can run on 87 but I maintain the habit of running 93 with Sta-bil. no issues on either bike.
The Honda carb passages are tiny and clog easily while the W has not required a carb cleaning 4,000 mi into my ownership. Previous owner maintained the same, but I attest this to the fact the 'Love Dub' is more modern. ha ha.
You don't need an oil additive for the Honda but I stress to change the oil every 800-1,000 mi. be on top of it! Lots of us run Rotella and have had success. I run it in my W.