I have had some pinging issues lately and found out that i can purchase 110 octane leaded gas at a local station. i have been running 91 (ethanol free) gas. the bike: 2005 RM265 with head porting. first can my bike handle leaded fuel? second can my bike handle 110 octane or should i mix it half and half with 91 giving me something like 100.5 octane gas? or maybe 3:1 for 95.75 octane?