Many manuals publish RON (Research Octane Number) rather than the M+R/2 octane number displayed on pumps in the US
The big cast iron V8 in my Silverado don't care what octane you put in it, I find my small engines, especially air cooled engines run better with premium, most local stations, that's 91, rarely 93
personally, and probably only cause I can get away with it where and when I ride, mid day, mid week, rural roads, no commuters, I can accelerate and decelerate gradual without the pressure of surrounding traffic to be a jack rabbit
@65mpg, my AK550 is my best fuel economy vehicle, even better than my K-Pipe since I replaced the oem 125cc with a 190cc motor, I'm lucky to get 65 miles/gallon now, the 1.1 gallon fuel tank I can visually see the gauge drop at highway speeds, I had one tank I recorded at 44mpg (ride up the Mt Washington Auto Road
https://mt-washington.com/ but also as high as 75 mpg, normally 60-65 hard to know, an extra splash makes a huge difference, as can trying to fill it to the brim on a hot day to have it expand and piss out the overflow. Used to routinely get 100+ with the 125cc