Before I start, I did the search and still couldn't anyswer my question. I read all the debates and heard both sides about the lead deposits, lubrication, and cost difference so......Has anyone ever actually had a problem running AV GAS? I've read what it can or can not cause but has anyone really ever had a problem? Any info will be great. Also, I'm not the octane expert so, will 170psi and +4 timing be ok on staright 100LL AV GAS? Or would you run higher octane? PLEASE DON'T RIP ME A NEW ONE....I'M STILL A ROOKIE!!! :biggrin: