[sam345]

Just curious, where in the wikipedia article does it say Private jets don't use leaded gas ?

Just searching the article for "lead" only gets this quote: "The possibility of environmental legislation banning the use of leaded avgas (fuel in spark-ignited internal combustion engine, which usually contains tetraethyllead (TEL), a toxic substance added to prevent engine knocking), and the lack of a replacement fuel with similar performance, has left aircraft designers and pilot's organizations searching for alternative engines for use in small aircraft."

Also a reference to "Planemakers challenged to find unleaded fuel option - The Wichita Eagle" a 2009 article which has a dead link.

Curious to me why you would cite an article that says the opposite of your assertion and then repeat the definitive statement. I must be missing something.

[ska]

Jets don't use avgas (which is still available with lead), they use jet fuel.

The planes you are thinking of are mostly used for hobby flying or some short haul commercial flights, e.g. float planes. These have piston engines, more like your car ICE.

[ceejayoz]

Avgas is not used in jets. It’s for the little four seat propeller Cessnas you see tooling around.