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Rpm question

906 Views 7 Replies 5 Participants Last post by  firemansdiesel, 
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I have read a few post saying they are around 1500 to 1650 rpms at 70mph. Mines is just over 1850. Is this correct . Hand calc on mpg is about 17.49. That's is over 5 tanks and 50/50 hwy/ city
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Ram3500Dually
With 3.42 gears you should be at 72 MPH at 1625 RPM
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