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Leaded fuel. Avgas is 100-octane leaded gasoline that is still being used by most small aircraft piston engines. Lead-free alternatives exist, but production and supply infrastructure is nonexistent.
The same kind as being used by the hyper-rich to nip down the shops for a ham sandwich?
Those use Jet-A which is just diesel/kerosene without the additives
Less likely, as those aren't piston engines. This is the kind of fuel used by single engine Cessnas and the like. Nearly all propeller/turboprop planes, as opposed to jets.
Jet fuel never had lead
That’s why it can’t melt steel beams!