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Originally Posted by RPMvulocity
i heard if u have a bov and jus as long u drive without the bov goin off u be driving okag mpg. but that could jus be a urban myth
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Yea, it takes some airflow/pressure to make the BOV go off. Anytime you are near 0psi or above, you are using much much more fuel than when you are in the 20 to 5 inches of vaccum range.