Almost all gas has 10% ethenol added to it , pure 100% gas is rare . When I go to Vegas for the winter & I will ride in NV , CA , AZ , UT & all I can find is 91 octane gas & my bike will ping when going uphills , so I started using the Lucas octane booster & it seemed to help , they also oxygenate the fuel in the winter months out there & that may have something to do with it . Here in Michigan most all premium gas is 93 octane & I do not have any pinging in the motor at all , so there must be something to that .