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Depends on the car and the pump. My regular gas stations don't tend to "spill over", so I let it fill until it stops, then wait 10 seconds, then remove and reinsert and give it one more "click." That way, I'm sure that it didn't click off 2 gallons too early. I pump slower at unfamiliar gas stations, as the Clunker tends to trip the pump too late and dribbles a little onto the paint.
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