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I don't have a civic but I've seen both on here, from your other thread I saw you have a scangauge II and scangauge E so you could always do some testing to see what you're comfortable with. I recommend trying out a full block just to see. That will give you the biggest gains so it's worth a shot.
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Aiming for 50 MPG from an automatic.
See how I'm doing here, My Build Thread
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