4x91

diesel exhaust fluid? i have never heard of that

old_programmer

DEF is a diesel emissions thing. The fluid is sprayed into the exhaust to break down the NOx emissions into nitrogen and water.

And a very nice truck. Wish it was in my price range.

AutoAnything

It's a urea based additive to help the catalytic converter break down NOx. This is the stuff that VW wanted to avoid, claiming that they could make their diesels efficient enough without it... You can see how that worked out for them.

Pugga

iTrader: (1)

And diesel owners wish they didn't have to hear about it. It's just EPA silliness.

jeffinthebag

DEF actually cuts the miles per gallon by 1 or 2 mpgs depending on the weight of the cargo load. It' might make the exhaust cleaner and safer on the way out, but you have to burn more fuel overall. In one word, Politics. Same as the additional diesel fuel tax.

5.0GN tow

Well per pickuptrucks.com and the manufacturers, this may not be true.


DEF will kill my fuel mileage.
Quite the contrary. Because the manufacturer is able to tune the engine any way it wants to, and then allow the SCR and DEF to take care of the pollutants, most manufacturers have discovered better fuel mileage (compared to other smog-reduction systems). Truckmakers claim it improves fuel mileage by as much as 5 percent.

boom50cal

Wellll what they claim and real world results are two different things.

http://www.thedieselstop.com/forums/...ievers-300825/

Good friend of mine just bought a 2012 Duramax, drove it from Tulsa to Duncan, OK, which is roughly 200 miles and 95% of the time it was @ 75mph. Truck was bone stock apart from an Edge tuner set on ECO. He did a 5 inch straightpipe with stock downpipe, egr block off, and an H&S Minimaxx. Truck averaged 13.0 towing an Cadillac Escalade EXT from Duncan, OK to Dallas, TX on a tandem axle bumper pull. On the way back, unloaded.... it ran 18.5mpg. Mind you, it's an 8,000lb 4x4 Dually with 4.30 rears.

jeffinthebag

I'm just going by my real world experiences I have with our older vs newer diesels. I can say I have not seen any increase in mpg but only a slight decrease running the same roads with the same loads. The only variable is some of the trucks are PRE-DEF diesel and some are newer models requiring DEF.
No trying to argue but just stating my opinion on the last 30 plus years of driving.

5.0GN tow

Mine is so new, there is no way I would delete it. Right now it gets about 18 to 19 at 75 highway empty and only has about 1500 miles on it. About 13.5 around town, but its hard to resist diving into the throttle. The power of these 6.7s is addictive.

A friend has a deleted 6.7 Cummins and gets about 19 or so at 75 too.

feifel

iTrader: (3)

I am very undecided on these trucks there are things I like and dislike . I really like the 05-06 styling and then the 12-16 . But I have no real use for a super duty so my f150 is it for now!