Royal Dutch Shell
Marathon
Exxon/Mobil
Shintech
Valero
Conoco/Phillips
BP
Murphy Oil
Those refineries are all within 100 miles of me, and I may have forgotten a few..
They all make gasoline that has to pass rigorous testing by all sorts of bureaucratic regulating bodies...which also vary by state.
I'm pretty sure that the EPA regulates on filling station pump filters being changed on a schedule.
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