Quote:
Originally Posted by redpoint5
I am envious of those FE numbers DD.
I'll blatantly thread-jack by asking which year of the 2500 has the best potential for good FE? I was thinking 2003-2004.5 since these years went common rail but was pre-cat.
I have a '98.5 4x4 that gets terrible mileage due to a used up tranny. It used to get about 20mpg. Impossible to tell what I'm getting now with larger diameter tires and a broken speedo/odo. Perhaps 14mpg, which I cringe at the thought of.
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I really don't think there's a huge difference in which model year has the "best potential". Honestly, I would say driving style plays a bigger role than anything else. That being said, certain things influence that--running trucks with a DPF in a good-for-FE manner is almost impossible without causing DPF problems from it being too cold. Of course, all the fuel it takes to regenerate the DPF will kill you're FE as well. 4WD and an auto tranny will negatively impact your FE as well. The introduction of EGR hurt FE as well. Of course EGR, DPF, and cat can all be removed (not legal, but it can be done).
As far as your larger tires, I wouldn't think those would kill your FE (depending on how big you have them). All else being equal it would decrease you cruising rpm which might actually help your FE. When you say your speedo/odo is "broken" do you mean broken broken or just not reading correctly?