Anyone I've talked to haven't had any milage gains using tuners or CIAs either so your not alone. There are a lot trucks where I live, and I know a lot of people on here will swear by them, but you'd think I would have come across just one person in my travels who would have told me the gadgets have done what they claim they are supposed to do. I bought a K&N for my old '98 and while a good filter did nothing for power or fuel milage gains. (As you can tell I'm not a fan of these plug-in miracles.)
How many miles are on the truck and how long since the last plug change, fuel filter change, tune-up etc.? Do you know what gears you have in the rear end? I never got good milage with my 05 either and never kept track of average. 16 - 17 was probably the best I ever got on the highway.
Last edited by pogster; 04-29-2012 at 03:30 PM.