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THE higher-octane fuel will make the B sing a little more, but I would still use an additive. The purpose of the additive is to cover the loss of lead in the fuel and protect the valves from recession.
THERE'S little that can go wrong if you use a trickle charger that's designed to maintain the battery at the fully charged level and not keep charging it. If left on charge for a long period without a function, a battery can explode.