If unleaded gasoline is the norm, why do we need to specify it at the gas station? I don’t think there’s even an option to buy leaded. Even if there was, why not have unleaded just be called gasoline and leaded be called leaded gasoline?
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it used to contain lead, which was better for performance but had terrible health effects. Now they always specify “unleaded” kind of like how coke is always “coca-cola classic” even though no one remembers new coke any more
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