1999 Dually 20k orginal miles 10mpg?
I am posting this for a friend of mine. He bought a 1999 Dodge 2500 2WD with auto transmission. The truck only has 20k orginal miles on it. I am not sure as to what gears he has. He is telling me that it is only getting around 10mpg. Any ideas?
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Have you seen the truck? Is it a V-10 rather than Cummins? I assume you know it's a Cummins, but at worse my fuel mileage in a QC 4X4 Cummins was 13.5mpg when it was brand new and I was driving in the Sierras with 5 people and a bed overstuffed with camping gear.
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That truck is just starting to get broken in at 20k =P
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The truck is indeed a cummins. The owner is older fello and only drives on short tripps.
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heck my 97 360 got 13 on a good day usually around 10-12 my neighbors dodge v10 gets 14 empty but around 9-10 towing his snowmobiles my uncle gets 11 in his ford v10 empty or loaded. It never changes
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I can't see how that truck could possibly be that inefficient without a bad leak or raw fuel coming out the tailpipe. I would check the entire intake system for an obstruction or something. That's very little use in seven years. Maybe take that baby out on the highway and open her up a little..
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I can't see how that truck could possibly be that inefficient without a bad leak or raw fuel coming out the tailpipe. I would check the entire intake system for an obstruction or something. That's very little use in seven years. Maybe take that baby out on the highway and open her up a little..
If he had a grease monkey shop do his oil change, there's a chance the intake is disconnected somewhere..Just guessing.. |
I have a '99 R3500TD with a 6-spd manual, Edge EZ, and other stuff. 17-18 no-load, 10-12 pulling a 4-horse trailer or my '53 drop-deck with 8-ton of hay. I never ran into anyone that got 10 mpg with no-load. I'd say that's abnormal...
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Originally Posted by deuceandahalf
(Post 1239497)
I never ran into anyone that got 10 mpg with no-load. I'd say that's abnormal...
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I still think the truck hasn't been worked enough to properly break in. Doesn't cummins say to wait 20k miles before switching to sythetic to allow for break in?
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Cummins diesels were not built to take small trips, they were built to pull heavy loads.
The rings probably aren't seated in yet. |
tell him not to floor it.he might get rod through his hood hehehehe
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I've got a 2002 HO 4x4 manual trans and I get 14 or so around town. On the road at 65 I'll get around 15 or so, at 55 I get 17, towing my 26' trailer 12 - 13. The best I've ever seen was 18.9 downhill, with a tailwind and a semi pushing.
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I had a 98.5 that I had a problem with. On the intake manifold down by the IAT sensor there was a 3/4 plug that had worked it self loose and fell out. This will give you no boost and thus pp fuel milage. It might be worth looking at. Just a thought.
Jim |
The Intake Air Temperature sensor may need cleaning or replacement. Its at the rear of engine on driver side. It requires a 13/16th socket. Remove and clean with carb cleaner and reinstall. If no gains replace. Its about 20$ at the dealership.
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