The Mothership needs an MPG Boost

[brothermothership]

I'll get the ECM details together and programming so we can go to the next step.

[jorden486]

What's so bad about 3.36 rears? My two new pete's have 3.25 with super singles. They run at 1300 at 65 mph and rarely downshift going up hills. Avg65-70k on a car hauler.

[simon999]

(05-30-2016 )jorden486 Wrote:  What's so bad about 3.36 rears? My two new pete's have 3.25 with super singles. They run at 1300 at 65 mph and rarely downshift going up hills. Avg65-70k on a car hauler.

I have 3.36 too. At 65mph I get 1350rpm.There is no problem going flatland but going hills need to downshift abit. I average 8mpg.

[brothermothership]

Amazing what a greaae job can do....mileage went up to 6.8 and hit 7 for a while. Brakes must have b been binding a bit. Oil temps are too high ( 226+ most ofl the time )
Rawze was right about the bad airflow. Going to go synthetic next oil change.
Anybody use Lubrication Engineers products?

[brothermothership]

Looks like the Mothership is loosening up, I am getting a consistent 7 mpg loaded after getting the oil changed and fuel filters replaced. This is on level, slightly rolling terrain. The truck is getting better.