Posted by MoparNorm on Saturday, March 04, 2006 at 9:12PM :
In Reply to: Somethings wrong with your truck.... posted by Jonas on Saturday, March 04, 2006 at 7:59PM :
2100 rpm is the Cummins "sweet spot" under that and the mileage soars, above that the mileage drops like a rock. I can get 25 mpg at 55 mph and 1800 rpm with an auto and empty (9,000 lbs empty weight). However 72 mph is 2200 and it drops to 16 or less depending upon the grade.
MN
* always say Jonas is right and he won't AXE you any questions.....