100LL works real good in my larger gassers like my G26 but in the engines where I'm using a 1/4X32 plug it will sometimes cause a slight missing condition when in transition. It usually clears after a couple of seconds. Someone here in RCU remarked that it was little whiskers formed from the lead bridging the plug gap temporarily causing that. I know it doesn't do it on regular unleaded MoGas and the G26's and engines with bigger plugs where I run a larger gap don't do it. My G26 has over 5 gallons of 100LL run through it now and is still on the same plug. I use it strictly because of the lower odor and a side benefit is it doesn't go bad as quick as MoGas.