In my experience, when adding a CAI any potential MPG benefits are outweighed by my lead foot. If you are interested in viewing some CAI options you can click HERE to view our available selection on our website. If you have specific questions about an Intake that you like, shoot me a message and I would be glad to help out as best I can.
In the old days, before fuel injection when cars used carburetors, a restrictive air filter made a difference, but now with precisely metered fuel injection, only the correct amount of gas is injected for the volume of air flowing into the engine. A restrictive filter may impact performance, but not economy.