Poor fuel economy/loss of power

[truckin151]

New plugs should make a noticeable difference, and personally I gained about 2mpg with the performance tune from Diablo, gained around 1 mpg with the superchip flash paq on their performance tune, LOST about 2 mpg with the superchips mpg tune.

 

[Jmdoft91]

Ight so I figured out I have 3.92 gears n my rear end by doing the ole jacking up the rear end n spinning the tire a turn trick and I also noticed that on the pigtail plug in off the wiring harness going to the coils n injectors that the wire on the second closest to the firewall on both passenger n driver side has been rubbed raw down to bare wire. Has anybody ever had anything like this happen? N I would think that that's where my poor mileage is coming from

 

[iJacob]

Just put a flowmaster super 44 on my truck and definitely notice a loss of power. :/ still love the sound of the 44.

 

[Redtruck-VA]

Just put a flowmaster super 44 on my truck and definitely notice a loss of power. :/ still love the sound of the 44.

Yep, I found the same thing when I used a flowmaster some years ago. It'll also hit your fuel mileage some.