My neighbor has been getting 9-10 mpg's out of his for the last year and the most common response I get from 6.0 guys is that he needs to do an egr delete because it is probably clogged and hurting his mpg's. Whether or not that is why he gets bad mileage (or the other guys I know), I don't know. Either way, it doesn't change the fact that they don't get the mileage you get out of yours.

Edit-Just looked up a few different egr delete kits and they all say that they improve fuel mileage on the 6.0.


Part Number: BDD1090001

* BD Diesel EGR Cooler Delete Kit
* Improves fuel mileage and engine reliability

From a 6.0 tech page.

2.What goes wrong with this system and how can it hurt my engine?
The other problem with the system is that the egr valve constantly gets coked up with exhaust soot. The dirty exhaust gas passing by it deposits soot on the valve surfaces. Sooner or later the valve will get enough soot on it that it can’t close and operate normally. Exhaust gas is constantly pouring into the intake manifold now. This condition causes severe drivability issues, POOR FUEL ECONOMY, and low power.

4.Will deleting the cooler affect the way my truck runs? Will I get a check engine light?
The answer to the first question is yes. You should see an increase in fuel mileage....

 

And the K&N cold air intake says the same thing, doesn't mean it is true. Of course they say that. Read around that forum, there are plenty of stock people, and if running right, they get way better than 9 or 10. I did have a buddy with a lifted 6.0 with 35s, f-350 crew/long that was modded similar to mine, that only got 10 or so.

I would advise your friend to do the following:
Check/change the air filter, replace only with OEM.
Change the fuel filter, only replace with OEM
Check for low fuel or other codes
Check the turbo boot, clean it
Check the EGR vavle, clean it
Flush the coolant, add a coolant filter
Have the ECT and EOT temps measured to ensure they are within 15 degrees
Use Diesel Kleen or some other cetane additive

The way you word it above, it says in the past year. To me that means it didn't always get that mileage. I bought mine last year at 93k miles and modded it around 102k and have almost 119k now. My mileage is roughly the same now as it was before, really the biggest difference is EGTs are lowered so I can pull hills better.

 

His is the worst one I have seen when it comes to mpg's. It's an xl, reg cab, manual, 4x4 with nothing in it but him. It's an 07 model, he bought it new and it has less than 20,000 miles on it. For a while he was getting as high as 12 mpg's out of it but for the last year or so he said it has been around 9-10. No smoke, no power loss, no CEL or any problems of any kind other than the mileage went down.

 

The technology did improved, but not necessary for Ford. I still consider my 99 PS 7.3 diesel the best truck available on today's market. Would love to own the 25 mpg Sprinter as a back up for smaller loads.
Than this is the readout from my 2005 car. The 49 mpg averaging 81 mph.
The 2005 car makes about 9 years old technology?

 

It is still in warranty, if he were my friend, I would suggest he get it in to the dealer. These engines can have codes with no CEL, in fact it is very common. There are codes that cannot even be read by standard code readers. A regular cab manual should get way better mileage than mine, even bone stock. A dealer should be able to diagnose it. Honestly, my guess is with the little mileage, it sat and the turbo vains rusted, and it is not providing proper boost.

When done at the dealer, I would install a coolant filter ASAP.

 

Being old does not sound like much fun.

 

I prefer the word "experienced"
Like 7.3 is experienced and reliable engine

 

He's had it in the shop numerous times trying to figure out what is wrong with it and they can't find anything. They kept it for over a week straight one time and checked every last thing on it and still no improvement.

 

He needs to find another dealer. If it was in the dealer, doubtful it is a clogged egr as they usually clean that.

 

Have you ever seen a gasoline powered freight locomotive? The fuel is more conducive to effiency, and power building in a Rudolph Diesel engine. Even a Diesel powered marine crat is more reliable, safer and has a longer working life. All while properly maintatinededed. So, that means the answer to your ? is the difference is great while the advantages are clear and the caveats are on the side of the owner with the most shallow of pockets. All factors being equal, the Diesel is the preffered choice of military and industry. Not to mention the diesel does not have a throttle. And does take in a maximum capacity of air on each stroke, while ideling on a mere mist of fuel. while the V-10 without the effieciency is powerful, it is only a good alternative to the vastly superiour powerplant of a Diesel engine. This response is without prjudice, as I have owned several models with each engine, and have found through thousands of gallons of each type of fuel that the gas vs diesel comparison is in it self a flawed argument. It is on the same level of comparing a Prius to a Bulldozer.

 

My 2008 Lariat F150 with a 5.4 was rated 13/17...I got right around 13/15

 

Then you need to talk to Phillips91 since I own a 6.4 PSD that would eat your V10...

 

My 09 SD has the same size tires and rims as my 08 F150. Same OD.

 

Dayummmm...all the way down to first gear for a mountain pass?

 

Like I said before, at that elevation his engine is making less power than a first generation 4.6. He is also afraid to press the gas pedal and isn't even reaching peak hp(not the trucks fault). What gear he is in doesn't matter because the gasser has to be a gear lower than the psd in order for both to be going the same speed at peak power. For example, Bill can do 80 mph in 2nd gear with his v10 while my 7.3 is at the redline in 4th(same as Bill's 3rd) at 70 mph. It doesn't make his truck "weak" just because it is a gear lower to do the exact same thing.

We also don't know the speed limit on the hill he is climbing either. He did mention a 15 mph speed limit through a curve, so I can't imagine the speed limit being too high.