Jack may also be against E15, the impurity of mixing ethanol with gasoline:
How Is E15 Harmful To My Engine?
April 7, 2022
https://www.mcnallyinstitute.com/how-is-e15-harmful-to-my-engine/
There are significant concerns raised regarding ethanol as it corrodes many of the plastics, metals, and rubber components utilized in internal-combustion engine fuel systems and other internal-combustion motor components.
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That's already been "debunked" elsewhere, but some cars may still have problems.