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If you want a point of comparison, this is my truck:


2005 hemi 1500 4x4 short bed standard cab. short, but heavy

3.92 rear end, with the 20" wheels. 275/60 R20 I think they are. pretty tall. not huge

With a mix of city and highway driving, the vehicle has a lifetime mpg average of 14.4 according to the computer. so I wouldn't expect higher than 14 with a 2500



I have the exact same truck and that's about what I get. I've gotten 20 on the highway but everything was perfect, 17 is more realistic. Tire tread design and compound play a huge role in mileage, when its time for tires on your truck put some highway tread/hard compound tires on it (if it's practical)