I work with 100LL AVGAS and though i've never put any major thought into it but what type of effect would it have if it were mixed with 93 Octane on a track day or something to that effect? totally theoretical discussion just looking for some input

 

When I went up north I was unable to get 93, so I added a few gallons of 110 to my 91. I did not realize it was leaded. I saw a lot of the material in my oil when sent out for testing. They mentioned if used in excess can lead to premature bearing wear and other issues.

 

I believe that Avgas still has lead in it and will kill your O2 sensors and CAT. Nice fuel to run otherwise.