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Old 09-17-2005, 05:50 PM   #15
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Cummins recommends maintaining a minimum 1900 RPM under load with the ISB
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Old 09-17-2005, 06:02 PM   #16
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Fat fingured that one!
Cummins recommends maintaining a minimum 1900 RPM under load with the ISB in non Dodge apps. My truck weighs 14,000lb bobtail and 1900rpm/57mph gets my best mileage @14/15 mpg.
http://www.powerspec.cummins.com/site/home/index.html
Good Luck, Jim
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Old 09-17-2005, 06:22 PM   #17
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We have a '02 & '03 Dodge cummins HO's with 6spd's in our trucks we use for both hauling RV's and also steel pipe on flatbed trailers. We run these things every day usually 60-70 mph. Fuel mileage pulling the flatbeds averages 9.4 on the '02(198K miles) w/17K lb and 8.9 on the '03(123K miles) w/17K lb. Drivers haven't seen any real difference in running 55-60 mph.
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Old 09-22-2005, 01:30 PM   #18
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You must MASH Your motor.John
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