Fuel Milage

[Texas Diesel]

Fuel Economy



Q: What is the typical fuel economy of a Ram with the Cummins diesel?



No such thing as typical! Loads, right foot "operation", frontal area, terrain, temperatures, and winds vary widely!

Here are some 12V rules of thumb: YMMV! Due to EPA emissions regulations, ISB engines get 2 mpg less than the 12 valve engines.



3/4 ton 2WD with manual, street tires and

3. 54 axle: 23 enpty, 20 loaded, 12 -17 mpg towing

4. 10 axle: 21 empty, 19 loaded, 12 -16 mpg towing

3/4 ton 2WD with automatic, street tires and

3. 07 axle and 3 speed auto: 20 empty, 18 loaded, 12 -16 mpg towing

3. 54 axle: 21 enpty, 19 loaded, 12 -16 mpg towing

4. 10 axle: 20 empty, 18 loaded, 12 - 16 mpg towing

3/4 ton 4WD with manual, trail tires and

3. 54 axle: 22 enpty, 19 loaded, 12 -16 mpg towing

4. 10 axle: 20 empty, 18 loaded, 12-16 mpg towing

3/4 ton 4WD with automatic, trail tires and

3. 54 axle: 21 empty, 18 loaded, 12 -16 mpg towing

4. 10 axle: 20 empty, 18 loaded, 12-15 mpg towing

ALL 4WD trucks:

Larger tires do not hurt mileage and may actually help by 1/2 mpg.

Lift will cost about 1 mpg for each 2"

brush guards and winch bumpers will cost 1 mpg

1 ton 2WD, 4WD - look at comparable 3/4 ton and:

take 1 mpg from empty and loaded mileage, towing mileage is about the same as 3/4 ton

All models: expect 1 - 2 mpg less in winter

ISB engines get 2 mpg less than the 12 valve engines. ISB engines get 2 mpg less than the 12 valve engines. http://dodgeram.org/tech/dsl/FAQ/diesel_faq.htm

 

[mbrolin]

We put over 3000 miles pulling the 5er in May. This was a combined weight of over 18,500lbs. Went from Oregon to Idaho,Utah,Nevada and California. Overall loaded MPGs was 11. 5. Anyone who has been out this way knows there are some fairly good climbs out here as well. The truck has 17000 miles on it and if it improves even more with age I would be tickled pink. BTW,with the 3. 54s,5th gear at 55mph equals 2200rpm. This HO 6spd loves to work!