Thread: Jeep Renegade
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Old 06-01-2017, 12:58 PM   #9 (permalink)
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Civic DX (sold) - '97 Honda Civic DX
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The last study on this page found that dirty air filters don't hurt fuel economy on fuel injected cars compared to new air filters, just peak performance. I think it's safe to assume that a freer-flowing air filter won't help mileage either.

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