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O believe that is correct, then you can buy GDE's new 49 state WPA approved engine/trans combo. I think there may be a significant discount but you can check. Don't quote me on that. You can also purchase another trans tune from a different tuner and keep your current GDE tune.

You cannot buy a GDE trans tune if you keep your pre EPA GDE hot tune.

Nope, that's a new one on me!

The simple thought is don't install it! Sounds catastrophic!

There is no correlation between your K & N air filter and a drop in mileage unless it is incredibly filthy.

Most people that have it seem to recommend it. Why not just go for a quality tune?

I have been reading ecodiesel forums since I bought my 2015 brand new and have never heard of the 1/4 tank issue you describe. I typically take mine down to that level before I refuel and have never thrown an engine code since day one. That being said many really seem to need a larger truck with...

GDE does a full ECU swap I believe (not 100% sure on this). GDE is a file swap via hand held tuner also. They no longer do an ECU swap

A good engine tune will certainly change your trucks performance characteristics for the better but I don't know how you could improve the "ride". These trucks are known for their car like ride.

None require any real expertise to install, any one with basic mechanical ability can do it. I would say if you can change your own oil and follow directions you are good.

can you describe the "oil consumption test"?

Can you contact the previous owner? It would be nice to know it was an ECM swap or there is a flash tool around for it. It is a full delete or just a tune.

My guess is it was probably low to begin with? I assume you have checked for leaks, etc....

No need to clean my EGR 😁 I throw some Stanadyne in almost every tank. My driving habits are not conducive to getting 27 mpg!

The 2015's are known to be finicky with light conversions.

Very nice looking truck, I would be very happy with 27 mpg!

There are many that do just what you are wanting to do with a 1500 ecodiesel. Some will tell you a jump to a 3/4 ton truck will offer greater peace of mind. I tow a 26' TT that we load to about 6600 lbs. and it took some work, research and diligence to set up my T.V. and T.T. with my WDH . I...

Why? Chicago is an amazing town, great restaurants, world class museums, fabulous blues music. All kinds of great things there!

Wow, there is a lot to unpack there and I feel your pain with all the repairs. To be honest I don't think I have ever really read too much about those types of problems on the various forums. It kinda makes me wonder if there was some substandard suspension work or a lot of water involved...

There are no tunes legal in California