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My 97 Dodge 3500 gets 22mpg solo and 14 pulling the Montana. The engine is basically stock other than the fuel plate slid forward and a K&N filter in the stock air box. I have the 3:54 gears so acceleration does suffer. That (acceleration) will improve once I buy a good aftermarket torque converter.
My Cummins engine is the old 12 valve. They always got the best fuel mileage. But a nice shiny 4 door Dodge 3500 diesel sure would be nice!
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