I used a data sheet from cummins in order to compute my mileage so i know what kind of setup to use so it will be an optimum setup. According to the cummins data sheet, if I run 33", 3.07s, and an NV4500 so .76 OD, I will be getting around 17mpg. Does this sound resonable? I was expecting more, my big Dodge 2500 got over 20 with the 6BT... If so, should I add an Aux OD to drop the rpm's ?? BTW, I uploaded the data sheet I used if any of you would like to look...
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