Filling stations are required by law to have a sticker affixed to the pump which indicates the octane rating and ethanol percentage and the last time it was measured for dispensing accuracy. Today's regular gas usually means an octane rating of 86-87 with 10% ethanol. My 1100 Shadow has no problems running with that mix. but I like to run some non-ethanol gas from time to time and fill the tank with it just before putting the bike away for the winter.