Re: High/medium/ low grade! What octane for your china girl!
I used to run the best gas in my Yamaha roadstar just to get the additives they claim to put in it. The bike had an 8.3 to 1 CR so regular was all it needed.
Turns out, in this town, the premium gas gets old/stale in the tanks at the gas station while the 87 is always fresh. I switched to 87 and never looked back.
I'll run 87 in the bicycle and always have fresh gas.