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im looking at the AEM Cold Air Intake - 96-00 Honda Civic CX/DX/LX

for my 2000 LX, can someone explain to me how it increases MPG

 
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it doesnt. whole point of getting cold air intake is to get more and colder air into the engine for better power. cold air has more closely packed oxygen, so the ecu sees this and injects more fuel. if you want fuel economy, get a short ram intake, it takes warm air in from the engine bay and the ecu will inject less fuel since there is less oxygen in warm air. but you prolly wont gain much (if any) hp either way from a civic. maybe 2 whp above 4k rpms.

 
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but lots of people are saying that they get more from it!

 
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not with a D engine.

 
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so if i get a short ram intake it might help with the mpg

 
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Ya. it lets ur engine breath WAY better than stock intake.