Oct 10, 2017 · My best fuel mileage with stock tune was always 1600-1700 rpm with our '05 Ram H.O. 5.9L Cummins. 1600-1750 rpm works nicely! Part of this is the aerodynamics (lack of) and vehicle dynamics.
Cummins 5.9L turbo diesel, few dings and few rock chips on the motorhome otherwise EXCELLENT! Generator runs perfect, very well maintained, 2 tv one in bedroom and other in living area, vcr, satellite dish youll have to hook up yourself. Cummins changed to the common rail for 98 but sold out the mechanical thru 98.>>>Dan ( His description of the pump being on the rear left side makes me believe its a pre-common rail engine) « Last Edit: February 17, 2011, 06:10:16 PM by utahclaimjumper »
Jun 05, 2013 · Because of the tighter emissions requirements it must meet, fuel economy for the 6.7L tends to be slightly less than the 5.9L. Having said that, the 6.7Ls that utilize DEF will get about 10% better mileage (per Cummins) than those that don't (such as those utilized in the pre-2013 Ram pickups), but the cost of the DEF must be factored in.
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