I have a 2004 3/4 ton cummins and was wondering if theres any thing I can do to increase my MPG

 

Use the search function the read the 10000000 threads out there about this in the past few months.

 

Leave it in the garage! LOL! Just kidding! Is it a 04 or an 04.5. I have a 04 with 315's, 6spd, and 373 and average over 18 unloaded. I am happy with this for such a capable truck! Like He said just do a search and good luck.

 

That' good. Should he leave the motor on at an idle?

I also get about 18 on mine. Probably 60% hwy.

 

We have had great sucess with the Edge EZ and an AFE Intake. Most have reported about 2-3 MPG....but i would say ave around 1-2...if its better.....great! I would at least replace the muffler with 4" high flow.....or go 4" exhaust.....the muffer is very restrictive....just the muffler replacement alone will probly get you about a mile......just from what i have seen from my cust's trucks.

If its a 600......HAHAHAHAHAHAHAHAHAHAHAHAHAHAHA

Dan "Mudinford" MacDonald

 

Remember, the 2004.5 come stock with a 4 inch exhaust. So, what people usually do is replace the muffler, see recent posts re: Donaldson mufflers, and others. It doesn't sound like this usually gets you much improvement. From what I've read, the air inflow is the better route.

 

Towing something and getting your Cummins to work a little might give you better fuel economy too. Besides it's really fun to tow things with these trucks.

 

i get 17 on highway doing 80 mph, just took it in to the shop they fixed the drive train and now the vibration is gone.

in town i get 20-22 matters how much traffic and the red lights.

with no upgrades im actually pretty happy with the truck.. after my warranty goes out im going to modify the hell out of the truck cant wait

 

If your considering things like a tonneau cover or topper to help with aerodynamic drag it will help with cruise fuel economy. Ther is a message posting in the 2nd gen no drivetrain forum talking about tonneaus with a lengthy discussion on increasing fuel economy based on aerodynamics and includes a link to research done by cummins on their big rigs.

None aero, look into timing chip, exhaust, intake, proper tire pressure, and a light foot should get you close to if not into the 20's

 

Stay under 70 MPH....Straight Pipe.....Hard Tonneau Cover.....all helped mine.....only a 2 WD and get 25-26 mpg