Re: Fuel Question
Tetra-ethyl-lead or TEL as an anti-knock additive wasn't widely used in auto gas until the years following the model A era where octane ratings finally started to show up at most filling stations. With the lower compression ratings in the model T and model A eras, most cars would run on anything that had enough volatility to support internal combustion. Ford had enough adjustability in the spark control and Zenith carb designs to run stuff that wouldn't even be considered for fuel use in this day and age.
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