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Re: How to improve fuel efficiency
..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".
Currently in spacecadet's garage:
Laguna 2 1.6 51 plate 5-speed