I never coast in gear unless I'm coming to a stop and I haven't timed my coasting properly.
Anytime I coast my engine is off if it is daytime and my 12V charge is at least 12V.
Nighttime driving drains the 12V too much.
I use the key because I'm too lazy to install an injector kill switch.
California98Civic installed an extra vacuum for engine off coasting.
LED lighting will reduce electrical load and allow you to engine off coast for longer periods without draining your 12V battery as much.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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