Leaded avgas is only used in piston-engine propeller planes. Jet fuel doesn't contain lead additives. So still not great, but a bit of googling shows that lea

Leaded avgas is only used in piston-engine propeller planes. Jet fuel doesn't contain lead additives. So still not great, but a bit of googling shows that leaded avgas is less than 2% of total civilian aviation fuel in the U.S.: https://www.faa.gov/data_research/aviation/aerospace_forecasts/2001-2012/media/Table%2022.pdf https://www.faa.gov/data_research/aviation/aerospace_forecas...