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 27th, 2010, 12:11 AM   #6
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1,800 is what I thought for MPG's

But what do I know...I'm running a 12V Crewcab on 40's with 4.10's and a 47RH auto
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