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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
05' 2500 with the hemi, QC, SB, see signature for mods, 1/2 highway 1/2 city, with 87 tune I would get 260-280 per tank (35 gallon tank with an average fillup of 28- 30 gallons), with 91 tune (usually 93 octane) I get 330- 350.
05 QCSB Hemi with 35 gallon tank the best i got was a little over 500 miles on a tank and the needle was just below the 1/4 mark. Usually get around 350-375 a tank mixed driving.
According to the overhead, my DTE on a full tank is about 385 miles. That's usually good enough to last me a full month since I use a different car to drive to work.
on recent trip to houston about 550 miles from where i live i went 400 miles on about 3/4 of a tank of gas before stopping for more fuel. 26 gallon tank computer says i was getting about 20 mpg. on the way home which was uphill i only got about 18.5. highway mileage of course.
Okay so the best I can determine is if you are getting 400 miles from a tank of gas you are doing pretty good. Also it seems that whether you have the V6, 4.7L, or Hemi they all get about the same mpg.