[aerohead]

Originally Posted by freebeard

Don't know about those, but there is a high positive inverse correlation between tetraethyl lead and the adolescent crime rate.

en.wikipedia.org/wiki/Tetraethyllead#Effect_on_crime_rates


Don't eat roadside dirt!

It's falling out of the sky every day a civilian piston aircraft is aloft.
The aero engines were never mandated to receive Stellite intake valves and chrome/nickle valve seats, so they still require low-lead AVGAS.