Low fuel mileage

Just recently put a new intake and pedal commander on my truck and ever since then I’ve gone from 14 mpg to 7-8mpg. Anyone know what could be going on?

 

Is it revving more in each gear than before? And is it downshifting more often with the pedal commander?

 

I don’t think so haven’t really noticed anything crazy with that. I’m just not sure if it’s a sensor or the intake

 

Intake manifold or cold air box?

 

Computer is probably compensating for a lean condition. I would look at all vacuum hoses and ensure you plugged in everything correctly.

 

Also make sure the air box is seated correctly. I would disable the pedal commander first, run a tankful of gas and see what happens