Ran 100 octane for the first time. Wow

Whitepunkonnitro is spot on. People love to think things are better because they cost more.

In 25 years in aviation. I can honestly say that I have never seen anything other than 100 octane low lead. They higher octane fuels were phased out years ago. Granted my career has mostly been around helicopters with turbine engines. Even the 100 low lead should not be run straight up in an automotive engine as it has significantly more lead than good old leadded auto fuel used to. It will cause lead deposits and possibly foul plugs in an automotive engine.