That should read "low-lead 100LL" avgas. Basically, the FAA drug their feet despite over a decade of independent testing data that indicated it was perfectly s

That should read "low-lead 100LL" avgas. Basically, the FAA drug their feet despite over a decade of independent testing data that indicated it was perfectly safe to run 100 octane equivalent "low-lead" in almost every extant GA engine. In the few that couldn't do it (mostly WW2 vintage stuff), they could be adapted to run it during their next required overhaul. These sorts of planes are mostly "ramp-toys" and only get a few tens-of-hours of flight-time every year at air-shows and meet-ups so they have very little environmental and gestalt time-in-airspace safety concerns anyways.