Needing a little help

[RStewart]

(08-31-2021 )Rawze Wrote:  

(08-31-2021 )RStewart Wrote:  ... I guess I should've stuck with Freightliner & the DD15 if I wanted fuel mileage.

I get every bit of 9+ mpg our of my cummins pulling dry-van and reefer freight .. MOST of it is application, how you drive, and truck specs.. not the engine alone.

I could get better fuel mileage if I slowed to 55mph and turned the cruise off but my Freightliner got better than this truck using the cruise and running 65-68 all the time. I usually run between 63-65 now and when I'm hauling freight I don't use the cruise and I keep my RPMs above 1300, usually about 1450. Truck runs much better there and as long as I'm not running the cruise it gets the best fuel mileage I've gotten with it. If I'm empty or light I can grab another gear and drop the RPMs but it doesn't seem to effect the fuel mileage any. Maybe I need you to put one of those custom tunes in mine. Lol