Lower fuel mileage - Ford Powerstroke Diesel Forum
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Old 01-06-2013, 06:11 PM
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Lower fuel mileage

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.
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Old 01-06-2013, 06:15 PM
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What state do you live in? Could be winter blend

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Old 01-06-2013, 06:37 PM
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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.
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Old 01-06-2013, 07:38 PM
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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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Old 01-06-2013, 07:41 PM
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Mine has dropped 1-2 mpg since the temperature has dropped as well.
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Old 01-07-2013, 03:07 AM
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yep, down 2 mpg's since october!
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Old 01-07-2013, 02:22 PM
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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.
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Old 01-07-2013, 05:55 PM
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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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Old 01-07-2013, 05:56 PM
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Add me to the low mileage club haha
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Old 01-08-2013, 03:51 AM
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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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