fuel milage

DEF reduces regens, EGR and increases fuel economy by 10% and gives the tuner the ability to increase HP/tq without increasing emissions.

Some of us just feel hesitant to make our pickups drink any mandated koolaid. It seems anti-freedom. And maybe the fear that it's new and who really knows what it will do to the truck over many years.

What if the infrastructure falls apart and we have to feed our diesels whatever fuels we can concoct? If DEF is unavailable, the truck will just stop working even if we have veggie oil or whatever.

Why would you want to do away with the DEF? It gives better mpg and longer oil change intervals. Read on the diesel forums the DEF is one of the least problematic issues.

Keith I respect you but I do have to disagree with you on one point. From what I have read here and other forums fuel economy is not better. In fact is just about the same as my dirty "old" 2007-1/2 Cummins 6.7L And I'm running a 4.10 rear end.

steelshooter wrote:
Okay, yall have convinced me to stay with the diesel.:B now I am curious if yall are seeing any difference in milage with the new vehicles using the exhaust fluid. What are the chances of doing away with the exhaust fluid in the near future.:@

The truck, after 800 miles or so of warnings, will simply refuse to start if you don't feed it DEF.
And good luck trying to beat the system, but why would you want to eliminate it?
It contributes to cleaner air, more power AND better fuel economy. (Better at least than the 3 or 4 years of trucks with regen systems prior to DEF introduction. Older, pre-2007, trucks may still be as economical as the new ones).
Improved enough to more than outweigh the minor cost of the fluid.
Top off the DEF tank when you change the engine oil and you will be all set.
It's not a big deal.

Chances of deleting new vehicles? ZIP,ZERO, NADA. DEF technology is so ingrained into the new trucks it is next to impossible to alter them any more.
As for the fuel economy? The reports I have seen they are no better than my current truck. And at least some of that has come from the crazy rear end ratios manufacturers are installing in new trucks.
My early production 6.7L Cummins dually with a 4.10 rear end gets 10.5-11.5 towing and I have seen as good as 18 highway non towing. Usually at 70 highway I get 17

What's wrong with DEF? It generally brings higher FE and more power.

Pick the truck you like best. They all now (2013+) require DEF. Fuel economy differences are not significant enough to warrant one brand over another.

I doubt if any difference in MPG would be that noticeable. You might see 1 to 3 MPG up or down.

With an RV it's the adventure that counts, ignore the mileage just have fun.