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Mercifully, though, modern airliners aren’t made by 1970s-era General Motors.

No, that's for small aircraft and their postwar era engine designs. To give you an idea of how slow development is in small aircraft engines, AVGas (Gasoline for airplanes) is still leaded.

That’s more because of how old the fleet is. Modern engines with fuel injection, electronic ignition, turbos, and (optional) constant speed props don’t really care as long as their ECU has a map for it.

New planes also get 50-year old design engines due nobody wanting to pony up $ for certification of new ones...

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