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I estimated about 3mpg from putting my alternator on an on/off switch. Over time, I have learned to make the switch into a kind of ultralight regen braking. On long hills or on almost any stop light or stop sign I can see well in advance, I shift into gear for DFCO and turn the alternator on to charge. The on/off switch is the best. I can do my daily trips without the alternator. Whenever I am in a longer drive, or night driving, I can run the alt more.
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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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