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To answer the original post, I eliminated my AFM/DoD about a year after purchasing my car new. A little more than a year later I'm very happy with it turned off. Only a very slight decrease in gas mileage on the highway. And I'm talking about 1 MPG or less being lost with it turned off.
On a similar topic, has anyone with a tune had their lifters replaced under warranty? Since this is a known issue I'm wondering if the dealer gave you any problems? Mine are just starting to make a little noise, not enough to bring the car to the dealer but I'm watching it closely.
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