[Ridenour]

Well I guess if you wanted to get technical, since you're saying increased "airflow", then you're talking increasing your displacement or air capacity of your heads = which would equal more fuel to compensate for more air = worse mileage. But I think you mean does less "restriction" (cold air intake, ect.) increase gas mileage, and like Curtis said, the answer is yes, because the engine doesn't have to pull as hard to get the air in - but it's very small, and like he said, very dependent on driving style. Just thought I'd hit upon that technicality.