Bad MPG

[DDouglas]

I have a 2003 2500 4x4 with a straight pipe, a Bully Dog triple dog, Glacier fuel pump 392, and a new set of injectors , the truck runs and sounds great but I have been getting the worst mpg ever, it has a new water separator,and fuel filter with fleet guard filters , and a new air filter, I used to get around13-to 14 pulling and 18-20 empty now I get 6 -7 pulling and 13-14 empty, it still pulls the same ,starts the same and runs the same as when I first got it. I have great fuel pressure, and no codes. What could change the fuel mile that much and not show any adverse signs?

 

[AMcCormick]

Tire preasure maybe or a leaking fuel line somewhere? Are you putting the throttle down and having fun, towing in head winds, trans slipping?

 

[mikeshauling]

could it be that with your mods and youe new injectors that you are driving it like you stole it ?? LOL Alot of guys that do performance mods do notice a mpg drop for a while, then they kinda lack off the extra power they are putting out and seeing the mpg pick back up... .