I was wondering how I could get the best fuel mileage with my truck. I have a 2002 dodge 24v 3500 6 speed. It has a k/n cai and a fass fuel system along with a smarty certainly on level 7. It is straight piped and has a south bend dual disc clutch.

 

skinny tire help.

 

Shave 5 lbs off the right foot that is where your biggest gains in fuel mileage is....

 

The first mod to my truck was a CAI. That alone, hurt my mileage.

Only after adding fuel did my mileage increase.

I don't know about boxes, since they don't apply to me but find the setting that only adds timing without more fuel.

Light right foot is a good idea. I have that problem myself.

 

Intake manifold and exhaust manifold to allow for very free flowing air/exhaust and then match that with increase in fuel delivery by getting larger bore injectors. (This isnt from experience, just my own reasoning/research)

http://www.dieselpowerproducts.com/c...manifolds.aspx

http://www.dieselpowerproducts.com/c...manifolds.aspx