I now have a stock over 475 still on stock fuel.
I average about 18 and can get towards 20 if I'm trying (hand calculated).
My major issue is when I have a long pull with 20k+ behind me, and I want to lock into 4th I'm pretty limited to the 55mph max kind of range or if it just feels like it's revved way out.
When I started to read more into Cummins designed operating rpm range, I will add that it made me feel much better.
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