My Injen CAI improved the mileage on my truck by a min of 1 MPG. The reason I say this is that the best mileage I have gotten with my truck prior to the CAI install was 13.8 with 2 dirt bikes in the truck, 2 guys and related gear. I just drove to Idaho from Nor. California pulling 3 bikes on a trailer loaded for 1.5 weeks of tent camping and dirt biking. I even loaded up my gas grill after cutting out the stake holes on the bed rails and building side rails so I could stack the load of crap I was hauling. I ended the trip getting 14.5 MPG on my 1800 mile round trip. It's still going to take a while to get my money back out of the CAI's price tag, but it's easier to sell "better fuel mileage" to my wife than "it makes a little more power and sounds cool!"
