2006 Gt sucking gas!!!!

The only mods I see that may hurt you would be heavier wheels and tires and the cai and tune and thats only if something isn't right with your cai and tune package. Was it that bad before the mods? Also you could drop Doug a line and pick his brain. If you go to a taller tire or wheel and don't correct the speedo with a programer you won't get the correct mpg when you go to figure it out. My GT gets 22 mpg around home and 25 on a trip and it wasn't good and broken in yet. Also going to change all my fluids over to synthetics.. On my 04 4.0 ranger 4x4, I was getting 18/22, after switching to synthetics in the drivetrain and adding a cat back, cai and bama program, it went up to 22/25. The mods helped in stead of hurt and should be the same in your case.