i'm fully aware of the 100LL. used to run it in my 12.5:1 340. ran great for awhile. last time i filled up with it carb ran so fat i could barely keep the engine running. dont know what that was about but i never used it again. i have an air port near by i could just pull up to the pump incert my credit card and fill up. i like the reviews on the c12. i also have turbo blue 110 available at the pump which i plan on using while cruising.