2016 Ford F-350 Crew Cab LWB Dually 6.7 Mileage

ppine wrote:
A new air cleaner is the cheapest way to improve your mileage with a diesel.

I drove a calm trip last weekend to the deercamp and made a solid 21mpg. Been doing this for the last 137k miles.

Chuck .. wrote:
I am writing to learn, not to push any product or name brand. I am not a salesman of any product.

I personally have had good luck with Amsoil Products for many years. Said this, does not mean I can not learn from others and or find possible better products.

Tell us all your opinion and experiences.

I've had extremely good luck with Mobil Delvac, Shell Rotella, and Ford Motorcraft oils. Never a problem with off the shelf motor oils running my two Ford diesels collectively >300k miles using the oils listed.

A new air cleaner is the cheapest way to improve your mileage with a diesel.

Chuck .. wrote:
I am writing to learn, not to push any product or name brand. I am not a salesman of any product.

I personally have had good luck with Amsoil Products for many years. Said this, does not mean I can not learn from others and or find possible better products.

Tell us all your opinion and experiences.

Stick with AMZ/OIL.

I am writing to learn, not to push any product or name brand. I am not a salesman of any product.

I personally have had good luck with Amsoil Products for many years. Said this, does not mean I can not learn from others and or find possible better products.

Tell us all your opinion and experiences.

Get rid of the K&N filter.

Good deal dropping the K&N

Thank you all for your replies. While DH is off on a hunting trip, returned loaner on his way south and picked up truck, don't know how it is performing. Will be anxious to see how it does mpg wise. He did tell me that the dealership, Ancira in Floresville, for you guys who live around here, said there was nothing wrong. He had also asked them to change oil and transmission fluid, neither of which had been done. They had had the truck four days! Go figure! Will have him read the latest replies to see if we can get any improvement if we implement any of the suggestions. He has ditched the K&N filter, which he installed at the suggestion of a friend.

Diesel fuel starts to cloud up at about 20 degrees. So you need to have projected extended below freezing temps for there to be problems which require fuel treatment at the pump. I'm not from Texas but I'd be surprised if they do much of anything to the straight #2 in San Antonio. And if they do, they can treat with chemicals instead of adding #1 diesel. You won't know unless you ask - and expect a blank stare unless you are at a truck stop. So I don't think that's the problem here. Even if they treat with #1, I'd guess the percentage is small.

Did the MPG drop right after the air cleaner change ?

Has it thrown any codes ?

Diesels are un-throttled engines. They flow a huge amount of air. I would go back to the OEM filter system and see if MPG goes back up. When something changes, I always look back at the last thing I did - that's usually what caused the change.

If you go back to a paper filter, get the Ford one. The after market versions can collapse due to the large airflow.

I get about 14-15 mpg around town from my 2013 F350 4x4 dually. I get over 20 mpg at 55-60 mpg and about 19 mpg at 65. All non-towing.

FYI, AFE was started by previous K&N employees and make a much higher quality oil type filter. Even theirs are not a good idea for any vehicle with sensors. Their filtration is great compared to K&N.