Before I even bought it I saw here to use 87 (lowest in the area). I cringed when I picked it up and he said he put 91 in it.
well i can now officially say that running 87 vs 91 i have picked up about 6.5-7mpg. And the bike feels way better on hard accel.
Awesome post i never thought of that i have always ran premium in my bikes until now.My only problem is my small engine teacher would flip over u calling it a motor, it is an engine it doesn't plug in.