I have a 2004 3500 dually, cummins, automatic with a 410 rear end. I am getiing about 16 mpg on the highway empty and about 11.5 loaded. My 99 3/4 ton was much more fuel efficient. Is this about what others are getting or should I be looking for a problem?

 

Sounds about right for a dually auto with 4.10. Changing the driving style (like slowing down) may have a slight gain in economy.

MikeyB

 

my 2005 SWB quad cab auto gets 20.4 according to the overhead on mixed roads. Hand calculated it gets 18.6 thats on two lane roads in east ky avg 50 MPH

 

The 04 is a bunch more H.P.and torgue also.

 

you guys are lucky, Im getting 12 empty 10 with an empty gooseneck on, who knows what it will be loaded. this is in an 06. I would love those numbers you are talking about and I dont know what to do about it. I already run below the speed limit.

 

My .02...I drive 6K miles per month plus and I can tell you that I must keep it at or below 2K on the tach or I pay for it. If I run at 1800 I get hand figured 18.8 and if I drive at 2000 I get right at 17.7. That puts me at 73 mph at 2000. If I can get 17.7 in a 2500 quad with the power that the 5.9 has I am jumping for joy. Just a little rpm increase means that it costs me over 1 mpg.

 

I'm getting 18-19 running empty, 14 pulling my small 5th wheel and/or 4-horse trailer, 12-13 pulling my 13-14K GN flatbed with a load, and 10-11 pulling my 32'x8' GN 3-horse with LQ. Those are all hand calcs. I suppose my average speeds are between 60-65mph, rpm is around 18-19K.

CD

 

Sounds about right to me.

I'm at:
20 cruising @ 60mph (1800rpm)

16 weekly mix driving

10 - 11 towing 13K @ 60mph - 70mph

All hand cal. Overhead is 5mpg over.

 

Was your 99 a dually? Did it come stock with 305 hp/555 tq at the wheel. Have you weighed your rig compared to the 99 3/4 ton? The only problem is comparing two totally different rigs. For comparison my 2500 4wd 03 305/555 got 19=21 hwy and 16-18 city when stock. Now with my mods it is 1 to 2 mpg better hand calculated filling the tank to the brim happy new Year

 

I have been averaging ~18.5. Since the Smarty Beta, I'm right at 20 running 75.

This is the first thread on MPG that I actually believe. All the #'s sound right on. Congrats on being truthful!!

Randy