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Your Civic will have a "smart alternator" that will boost voltage to 14+ volts or down as low as 12.5 volts or thereabouts, depending on the engine load, speed, and other conditions. I recently dealt with battery failure. Mine was a deep-cycle battery that was not well-adapted to this application, and I had damaged it with too-deep a discharge. Are you using a normal starting battery or a deep cycle one? Starting batteries are not as friendly to P&G, especially in the dark with all the lighting on.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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