Horrible mileage lately - Ford Powerstroke Diesel Forum
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Old 01-09-2014, 05:33 PM
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Horrible mileage lately

I recently changed oil to same the truck had, Amsoil synthetic, cleaned air filter and fuel filters, and added coolant additive. I have since then gotten horrible mileage. I used to be able to get a 17-18MPG on the liar meter pretty easily and every now and then I'd get a 19-20MPG. I can't get over 15 doing the same type of speeds, and if anything less as for some reason I have been driving more conservatively lately. Could it be the cold weather or the servicing? Makes no sense.

I have the .34 software on the mini max and nothing has changed. I did notice before or maybe towards the beginning of this bad mileage issue that my truck would seem like it wasn't getting much power and I would look and there would be zero boost reading on the mini max. I would then hit down a level and back up to the high that I leave it on and it would then start making boost.

Please help as this is pissing me off cause I am almost at 36,000 miles and end of warranty.
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Old 01-09-2014, 05:52 PM
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Depending on where you live it's the winter fuel blend.
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Old 01-09-2014, 08:11 PM
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Almost sounds like you have a boost leak somewhere, which will definitely cost you power and mileage.

Winter fuel blends will cost you a solid 1.5-2 MPG as well. Let us not forget that a cold engine is less efficient than one operating at optimal temperatures. It's all working against you in the middle of winter.

Greg
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Old 01-10-2014, 06:46 PM
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Houston, TX. Hasn't been that cold. I also make 25psi when I'm on it and no noticeable power loss, but I haven't checked for these reasons. I guess I need to check the hoses. Totally po'ing me, and I shouldn't let it, but I can't help thinking somethings wrong. Got 13 MPG today not goosing it at all but doing 80MPH on GPS, totally flat terrain. Do you think we would have a winter blend down here? I've known about that blend but didn't think it would be this big a problem. If I went 55MPH it wouldn't be 16MPG.
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Old 01-11-2014, 04:00 AM
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I'm pretty sure you guys down in Texas get winter blend diesel. I know here in Iowa, starting around Nov 1st and lasting until mid April, my mileage drops from 19 mpg avg to 14-15 mpg avg.


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Old 01-11-2014, 04:30 AM
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I can't comment on wether or not you get winter blend fuel but I will say 80 mph will hurt your mpg for sure. With these trucks the sweet spot is 60-65 for mpg.
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Old 01-11-2014, 02:00 PM
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80mph usually kills my mileage. Winter fuel plus 80mph you would see a significant drop.
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Old 01-11-2014, 03:01 PM
mcd mcd is offline
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Most likely winter fuel. My truck is all stock, and I have seen mpg drops both this winter and last winter. Usually gets better around feb/march, when fuel blends change.
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Old 01-11-2014, 08:34 PM
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Sounds like they should lower the price since the fuel doesn't have same amount of energy, all so it won't freeze, I'm guessing??
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