Bad MPG after installation of a CIA?

I have a 2014 Tacoma Crew cab 4.0 AT it has a 6in BDS lift with 265 75 r20. I recently installed a KN CIA and since doing so my mpg per tank has dropped significantly.. I will admit the first tank I was a little heavy on the pedal but the past 3 tanks I've drove like a granny.. Right now my truck has 183 miles on my last fill up and I'm sitting on a quarter tank which in every tacoma I have owned (3) 01+07+14 doesn't last long.. is this common or is there an issue after installing a CIA.. My 01 was a stock extended cab 3.4 5sp my 07 was a crew cab 6sp 3in lift with 33s and I got over 300m per tank without a CIA. I know a manual is better on mpg but a a result of both having the throw out bearing go bad I chose to go with the Automatic this time around. (REGRET) Im showing no codes but I feel there is something not right.. if this is a result of having a Cai I will be removing it..I like the feel and the sound of the cia but Def not worth it if I'm only getting 10 to 12 mpg.. any advice is apreciated.. thanks

 

Did you reset the MAF after installing the CAI?

Unplug the battery for 10 min then put it back on. It may take time for the computer to learn the now CAI and adjust accordingly.

 

My uncle who builds cars from the ground up is who installed the CIA. I was there the whole time and i do remember that was one step we somehow missed but realized it about 3/4 the way through and I unhooked it myself.. Im goin to go try it again right now.. SWEET Avid Offroad bumper bar just came in!!