As I said, you will most likely not see an improvement in gas mileage with any of those air intakes that are designed for engines that are running at higher RPM's, the same math based theories that say larger around and shorter intakes are good for higher RPM's say that smaller around and longer intakes are better for low RPM's, it's the same math that is used.
And if you look at the cars on here that are getting the highest mileage, they are often running a warm air intake.
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