eco giving 19mpg

[darksobsession]

lately my gas consumption has got down to 19mpg, much of this was freeway.

i never calculated the mpg before, but now i'm filling it up more often, so i took notice and started keeping track.

mods i have are pacesetter header, cai, larger wheels/tires

took it in to the dealership and they didn't find anything wrong.

got it back no charge and replaced the spark plugs and fuel filter myself. i have called the dealership trying to make certain they tested the iat sensor, but they ahven't got back to me yet.

any idea what else could be wrong w/it?