I don’t think making sense will help.
Hmmm, and who ran the Congress in 1990?
True. Somewhere in my memory was the ARCO out in California started using MTBE after leaded gas was banned. And as far as I can recall, the Feds in the early 90s required either MTBE or Ethenol to be used as additives during ozone season (May to Sept) MTBE was mostly a West Coast thing.