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It takes quite a distance to make much difference. Be generous and hope for 10% improvement. That's ~3200 miles before you break even. (3200,20MPG,$2.5gas) Expect worse but some engines do better than others. Depends on the original system. You save a bit cleaning vs. throwing away the filter. If you're keeping the vehicle it might be worth it. If you're looking for quick gains you'll do better to lighten the right foot.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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