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ORIGINAL: Sams0n
If better air flow from a CAI can't help gas mileage, then why does a dirty air filter hurt your gas mileage?
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Like I said before, more air means more fuel. If you burn more fuel, what happens? Ford has tuned these things to use the least amount of fuel, in order to get the best power range. Sure, you can retune it to get more power but at what cost?? Higher gas prices and more gas used. It's a trade off, but for the best fuel economy, leave the 3.31 in it and stay stock.