I also hooked up a 2nd battery in parallel. Voltage stayed up much better while coasting. My longest coasts here are about a mile and I could do that with headlights on, no issues. However the 2nd battery was a more "normal" size battery out of a Jeep, not the mini size we have in Civics.
Good move.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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