Dave wrote:
Where is it dictated that certain states/cities require ethanol in their
auto fuel?

The Clean Air Act of 1990 mandated Reformulated Gasoline (RFG) in certain
states/counties. Many other locations opted in to the program. RFG is a
gasoline with added oxygenates. In the old days, this was mostly
accomplished using MTBE as an additive. Since the demise of MTBE, ethanol is
the primary oxygenate in RFG.

John Galban=====N4BQ (PA28-180)

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