Great Lakes 4x4. The largest offroad forum in the Midwest - View Single Post - Where is the cummins rpm sweet spot?
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Old January 29th, 2010, 07:33 PM   #12
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17-1900 for best mpgs/dd and about 2000-2200 for towing. i dont care what anyone says over 2000 will not get you best mpgs in a cummins
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