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Originally Posted by TexasCotton
FYI just a side note following WW2(bandofbrother) Dupont came up with the idea of leaded gasoline and standard oil among others forced this on the American public.
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While most oil companies were switching to leaded gasolines en masse during the mid-to-late 1920s, American Oil chose to continue marketing its premium-grade "Amoco-Gas" (later Amoco Super-Premium) as a lead-free gasoline
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https://en.wikipedia.org/wiki/Amoco
Most underground fuel tanks in the past contained water. I remember my dad needing to stick (think very long ruler) the tanks to determine how much fuel and water were in the tank.