[Nuke]

From all I've read over the past 6 months, I'd say you'd see a very modest gain, perhaps 1-2 MPG as long as you weren't getting into it. My Stang is my long-haul vehicle and I've only had the CAI & tune for 1 major trip. Strangely enough, I was seeing about 2 MPG more for about the first300 miles on my last trip (same roads as usual) when it began to rain and over the next 100+ miles my mileage dropped back to my previous average. Similar thing on the way home going from dry conditions to rain. That was on my Brenspeed 93 tune. I'll be taking another trip this weekend on the 89 tune. I'm curious to see what happens but I'm expecting to see that 1-2 MPG gain.

You say you want to know if a CAI will increase your fuel mileage. I doubt the CAI alone will do much of anything.