I have a 05 crew cab dually and the mileage is not so good.
So looking at what the best tuner would be.
Edge ez , edge evoHT2. banks ,bully dog ?
Would like to stay around the 400 dollar range .
Thanks Brad

What kind of mileage does it do now (empty on highway)?

Get about 13.5 to 14.5
It's a 2wd

Always heard the Smarty was a great tuner for the commonrail trucks.

Yep, that's about right for a common-rail Cummins, thanks for your honesty.

I used an Edge 60hp on my '02 with 3.54's and it brought my mileage up about 1.5. I could get 17mpg if I kept it at 60mph but 16mpg was more average. I paid around $300.00 for mine new but you regularly see them in classifieds for $100.00

Just understand that everything from '03 and up the mileage took a dump for two reasons:

1. Injecting more fuel for the common-rail pre-injection event
2. The ridiculous idea to go to 3.73 gears. Diesels hate rpm and it robs fuel mileage.

my 12 valve got about 18 towing my open trailer at 75 mph.

Just put a edge ez in and it got worse milage on a 1300 mile trip.
It will be getting sent back lol.

Tuners are overrated in the improved mileage department. They will make the lie-o-meter read higher but actually don't usually help much. Some, in fact hurt fuel mileage. I would stay away from anything that plugs into fuel rail pressure sensor and fools the ECM to raising the rail pressure. They are rough on the injectors which already have reliability issues to begin with. I'd recommend a GOOD set of injector nozzles around the 50 hp range to help efficiency and add a little power instead.

Finding out the hard way that a common-rail Cummins won't do 26mpg?

Welcome to the real world.

Send out cash offers to purchase the trucks of the Delusional Morons on here who claim theirs' do: they seem awful quiet on this thread of yours, but I assure you: they do exist.

Big tires, leveling kits, 3.73 gears you name it: they get PHENOMONAL fuel mileage!!!!!!!!!!!!!!And the Dealers offer them unbelievable cash offers!!!!!

Sure. It's just me that gets 17mpg out of a Cummins at 60 mph. Everyone else gets 10mpg better than I do.

About your Edge experience: I find it hard to believe you paid, ordered, recieved/installed AND made 1300 miles in 3 days (by above post count). I call BS unless you can provide proof.

So, how about it? Got proof?

Where were you in 2004 when I chipped my truck!?!?!?!?

YES. The overhead console mileage never did match my hand-calculated.

Are you afraid to speak your experience when the 25mpg Cummins rears its' ugly head?!?!??!?

What is wrong with you, Man?

Well you can call John cope and see if I was at his shop sat. morning with a truck load of transmission cores and headed home with a 30ft enclosed trailer. I live in Baldwinsville NY and he lives in Lowell In. And egde sent the tuner 2 day shipping and it takes about 10 min. to hook up . I got the tuner thurs. and left Friday night . Oh and I could give you the phone number of the guy who drove 3 1/2 hours to me to drop the cores off to me . But hey I might be full of BS.

I'm not afraid of anything Grizzly. I have been working on these trucks since their inception. Not only do I work on them, I own and drive them. I have customers that make outrageous fuel mileage claims (close to 30 mpg) and I just shake my head. Most trucks daily driven will get somewhere in the 12 to 17 mpg range depending on how they are equipped. A 2wd manual truck will yield the best mileage whereas a 4x4 QC auto dually is at the bottom of the list. Put on oversized tires, hay bed, fuel storage tank, and a cow pusher on the front and you will be lucky to see double digits.

Mine is a 2wd with 4.10 gears .
With the tuner on ( tried the 1st and 2nd position.) got 13.8 I think it was.

Is that 13.8 mpg pulling a 30' enclosed trailer?

Okay you did the miles.

4.10's

There's your problem. These things are not meant to be wound up to 2200rpm

If you have the patience, run out on the highway on a flat stretch for 50mph and reset your av. mileage. Go for 20 miles. Do the same thing at 75mph and see how big the difference is.

If you like what you see at 50mph you can either switch to 3.08 gears or convert to 22.5 Semi rims. The closer you are to 1400rpm at your usual cruising speed the better. You always have 3rd gear for pulling heavy (should be about 2400rpm w/ 3.08's)

You're a lucky guy if you do the gear swap (2wd vs 4).

This should be thumb-tacked at the top of the Truck Section.

What makes the commonrail so much less fuel efficient than the earlier trucks?

No it was 13.8 empty . well with about 15 or 20 transmissions in the back .
When I went to monster mopar at Norwalk I got 16.4 with my golf cart in the back.
Back and forth to work on the highway and some driving around town it get around 14.5 ish

The extra fueling events of a common rail for noise (pilot injection) and emissions (after injection) hurt mileage.

The reason has already been stated in post #5, see above.