I know the Cummins "600" is very new but what is everyone getting for fuel mileage? Please list type of driving, speed, and vehicle specs (trans, axle, 2wd or 4wd, etc)

I am very curious if the new H.O. is better or worse than the old H.O. when it comes to MPG.

 

4x2 quad cab with auto. Has 1500 miles been getting 16mph.

 

That's pretty slow.

 

Don't worry about fuel mileage while its brand new. Mine only got about 12 to 14 MPH. mpg. It now has about 25,000 on the O.D. and gets 17 to 18 mpg. at 65 to 70 mph. Go pull something with it. that will help it.

 

Yeah, my HO 03 got about 17.3 MPG when new. Now it has over 15K miles on it and averages between 18 and 19 MPG.

 

I am still on the first tank full, the computer says 12 mpg. Hope it gets better than that.

 

rcolley, It will man promise you. Hey by the way fill in your SIG so we can help you later down the road. Tell us what you got on or in your truck.

Sittenbull

 

well according to the overhead computer mine has been getting 12.2 mpg. I have 600 4x4 6 speed. Truck only has 160 miles on it though. Hopefully will get better. Of course if you have been reading my other posts it is running bad so maybe that has some effect on fuel effiency.

Just thinking about it.....it seems like the extra injection event per power stroke would cause the engine to consume more fuel. Maybe getting the 2004.0 cummins H.O. wasn't such a bad idea after all....

 

Yeah that's it... '04.5 is emission compliant and burns more fuel at idle.

FWIW I got 24.2 last year this time with a brand new truck on the interstate. I am now getting 25.4 same interstate (I 75 flat and hot here) driving 36k later. I log every fillup, all mileage and calculate (by hand) every tank. Worst is 8 (did I tell you I hate winter and cold weather?) Either my truck is not broken in or your fuel mileage will suck for years to come. I think the latter. Have fun with your extra 20hp....