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post #4 of (permalink) Old 21st April 2015
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Re: How to improve fuel efficiency

Originally Posted by Phil48 View Post
..a dirty air filter will kill MPG..
There was an American study a while back. It doesn't. If the airflow is restricted the engine management just compensates.
Since reading it I haven't replaced an air filter.
Google "Effect of intake air filter condition on vehicle fuel economy".

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