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I've done a full tune up on my KA, and get around 20-22 city and around 28-30 freeway. And when doing that freeway driving, I usually have the tach between 3.5-4k.
Also, I did seafoam treatment and didn't really notice a huge difference, but I bet it cleaned the engine pretty good so it was worth the time and effort.
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1997 240sx 5spd
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