What a random townsfolk knows or has available as information is random, subject to author fiat, though I would tend to agree. That said, torpedo fuel, warheads, motors, and handling knowledge would absolutely be available as previously discussed as a semi-side issue.I doubt Newport would have information on refining oil. Or rather, anything more specialised than the basics which really wouldn't be any different from 1941. About the only major change, would be the types of jet fuelv that are best. Instead of stumbling through several different variations of fuel, they can go straight to JP-4 or JP-5. Both fuels were developed in the early 50s (51 and 52 respectively), so there shouldn't be any issues making them in 1942. Other than that though, I don't think the knowledge base would be there to really increase efficiency in oil refining.
Edit: I can say for a certainty that fuel separation knowledge (on the small scale) would be present as that is a function that modern sailors do to protect the fuel supplies from excess water or debris/impurities.
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