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The guy that invented leaded petrol also invented CFCs and died after getting caught in in a winch thing he made to get in bed after being partially paralysed by polio.
https://www.smithsonianmag.com/smart-news/one-man-two-deadly-substances-20th-century-180963269/
Sumo
Why don't garage forecourt signs and pump just state petrol and diesel. Why "unleaded"?