Back in 88 or so I had a bad experience with poor performance from regular auto fuel. My engine had a bad case of detonation. After that experience I have only used 100 LL in my type 4. I have never experienced a problem with sticking valves.
Orma Southfield, MI N110LR Tweety, old enough to drink this year Flying and more flying, to the gathering or bust http://www.kr-2.aviation-mechanics.com/
