Why am I getting such low MPG??

I'm down anywhere from 9mpg-13mpg depending how I drive... After my last truck, that's still better.
Like everyone else said, all depends on what mods you have and how heavy your foot is.
4.88 regear here I comeee

 

What do yall mean by removed air dam

 

The lower valance / chin spoiler

 

The air dam is the plastic thing under the front bumper. Doesn't come on the Pro or OR. Its worth about 1mpg better fuel economy with it on.

 

Ohh gotcha with one looks horrible and would guess plenty have been ripoed off if took off road . But ok now i know thanks , I too have had some low fuel milage performance but hard to really get accurate but i assume its due to short trips of 15 miles or less in few month time frame . I do sometimes feel a kinda lag associated with the mixture of vibrations thats changed in various ways with what ive been threw tryingnto pin point it with dealearship being of no help . So many factors can contribute to fuel milage that could be a malfunction that doesnt even throw a code or related to fuel delivery or how you drive , like physical moving parts as small as the vvt oil passage way for solenoid filter or driveshaft AND U JOINTS be slightly off essentially taking away from power being transmitted .i average 17.8 when i used to be at 18.5 or 19 mpg around christmas . December i had a rat chew threw my bank 2 sensor 1 camshaft position wire or vvt sensor to came shaft on upper and drove it about 8 miles like that with warning on screen to take to shop immediately, until i was able to get home and hook up scan tool and find sensor to rewire it to get by then months later rewire correct with new plug pigtail . Hasnt ran the same since . Its been so random and trying to know what's causing what and if can do anything tocsolve . It would take access to repair database and proccesll

 

Didn't read entire thread but did read quite a few comments that stated 'babying it' and 'drive like a grandpa' etc. . One of the best MPG in town trips I made was 22MPG. I was on it pretty hard due to a time issue and it really surprised me when I got to my destination and saw the MPG. It's counterintuitive but it indicated to me the engine tuning prefers to stay in the upper rpm range. It's hard to do when you have been short shifting your whole life to keep the RPMs low.