Woah. I didn’t know leaded gasoline was still available anywhere.

General Aviation fuel (think propeller planes) use Avgas still uses tetraethyl lead, which is "leaded gasoline".

So there's a shit load of caveats. One there's only a few places i know in the state that sell it. It's supposedly only for small engine purposes, and it's illegal to pump into a car. There's daily limits imposed by the gas station and weekly and yearly limits imposed by the state I think, but I never looked them up.