2007 Cummins ISX sucking fuel

I know this might sound like “duh” but I’ve seen it before....if it has a 13 sp. trans , be sure the driver isn’t driving it like a 10 sp. I had one tell me he was told to never flip that little red switch on the side of the shifter knob.....so he never did and got 4.2 mpg consistently.....

 

maybe

Person is speeding when you have people driving for you that's what happens its not their truck or fuel to buy so, I want to get their fast also heavy loads and speed don't go good together

 

I recently put up a post about the c15 cat I’m using drinking fuel as well.

It was tuned to 550hp/1,850tq from 475hp/1,850tq factory.

That tune from Cat is not efficient.

I had a reputable tuning company come to our company and fix a few things in the ecm and turn off the egr.

Power is now increased to 575hp/over 2,000 some tq.

Burned the same fuel amount of fuel as the lame 550 tune but hauls way harder with a heavy load.

Easy driving netted better economy than the previous tune.

No more engine lights and half power limp noodle mode.