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Just to fill in a little here - most people who seriously drive Corvairs have gone to electric fuel pumps. Nobody seemed to be able to make an E10-compatible diaphragm material for that pump for whatever stupid reason. I didn't mean to minimize the effect of ethanol on elastomers - I just...
You've stepped into one of my areas of competency. I worked in a vehicle emissions lab for about five years analyzing gasoline before and after it went through an engine.
Ethanol makes a pretty decent fuel for an Otto-cycle engine. Not as good a fuel as toluene or 2,2,4-Trymethylpentane...
Given that you're talking about a 1950s battlefield-ready tactical truck that was expected to run anywhere in the world, I think the best gasoline to use in an M38A1 is probably liquid.
Most engines with those design criteria have a minimum RON of about 75 or so, which would equate to a PON of...