* Model Year: Fuel economy has improved over the years.
* Engine: Different diesel engine options were available over the years, each with different power and efficiency ratings.
* Configuration: A heavy-duty truck with towing packages, larger tires, and added accessories will get lower MPG than a similarly equipped truck without.
* Driving Habits: Aggressive driving, excessive idling, and terrain all impact fuel economy.
Therefore, I cannot give you a single MPG figure. To find the MPG for a *specific* Dodge Ram 2500 diesel, you should:
* Check the EPA fuel economy label: This sticker is usually located on the driver's side doorjamb. It will give the estimated MPG for city and highway driving.
* Consult the owner's manual: This will provide the manufacturer's estimated fuel economy.
* Use online resources: Websites like fueleconomy.gov (in the US) allow you to search for fuel economy information based on the year, make, and model of the vehicle.
Expect a range of 15-25 MPG combined (city and highway) for most Dodge Ram 2500 diesel trucks, but this is just a broad estimate. The actual MPG will vary considerably.