
Up until last year I never changed the filter in my car and didn't notice any improvement. I was expecting at least an improvement in fuel economy, but it's stayed about the same. The filter I also had was very old, my car is a 2005 Civic with 90000 miles. I drove about 35mpg before and after, it might be a symptom of something else. I mean it's probably overkill how often you need to replace them.

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