And as I also said, it's been working fine for 6-8yrs with 10ga.I believe it's for 75 feet or less. Also it's for temp of wire and type of insulation.
As you said yours is based on using wire spec'd for aviation.
GM, Ford, Honda, Yamaha and all the other manufactures don't like to waste money. There has to be a reason they "overbuild electrical systems".
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Proof's in the puddin'... as they say.