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I'm guessing you have such a low RPM at 65 due to large tires? If so, they are probably hurting your MPG. 15 MPG in a Cummins isn't great.
Focusing on acceleration won't give you as much improvement as focusing on rolling resistance, aerodynamics, and avoidance of using the brakes.
I put tall and wide tires on my 5.9L and the MPGs dropped. The front end is not good, especially since the track bar wears out almost instantly. I've had issues with calipers dragging too. On top of all that, my tranny is going. I'm still able to get 20 MPG at 65 on the freeway.
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