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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
Jet fuel never had lead
That’s why it can’t melt steel beams!
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.