Lower fuel mileage

[PMGW900]

2012 King Ranch Powerstroke with 3:55 gears. Was getting 19 MPG until about a month ago. I run all highway miles. Driving has not changed, but mileage dropped to 17 and I can not figure out why. 20,000 miles on truck. No towing, just long highway miles.
Any ideas what could cause the mileage to drop all of the sudden? Ford dealer does not know and there are not any codes.

[Hawkeye Diesel]

What state do you live in? Could be winter blend

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[PMGW900]

I am in IN. Driving mostly IN, IL, IA. Never thought about blend making a difference, but when it started to get cold is when my mileage dropped.

[Black2012]

It's is probably winter blend. I have had a diesel for 9 yrs now and mpg always goes down in the winter.


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[Smitty44]

Mine has dropped 1-2 mpg since the temperature has dropped as well.

["Stroker 8"]

yep, down 2 mpg's since october!

[AresSD]

Mine has dropped too. Mainly b/c of warming up the truck every day since it's so cold of late. I did tow across Kansas a few weeks ago and the winter blend is just plain crazy when it comes to fuel mileage.....several mpg lower.

[Hawkeye Diesel]

Most stations on cold weather states start pumping winter blend around the 1st of november, I usually see a 2 -3 mpg difference with winter blend diesel. I live in Iowa by the way

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[Guardian29]

Add me to the low mileage club haha

[bruce65trojan]

I had the same problem and I live in South Louisiana. It doesn't really get as cold as you guys up north but do you think they run winter blend down here?


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