I can only simply offer my experience running without the alt since last September. The mod in this thread shuts the alt off completely if after flipping the off switch you cut the engine and bump start. Or if you never turn the alt on in the first place. The biggest gains are on the freeway, or any other driving over 40 mph, which is a condition when the ELD normally has the alt charging at 14.3 volts or so (full on). This means I can use the freeways more, get places quicker and still top 60mpg and more. That's my experience.
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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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