Weird drop in MPG
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Senior User
Joined: May 2010
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Weird drop in MPG
I have, since I did all the EGR work, routinely averaged 16-17MPG combined city/highway.
Now, all of a sudden, I am at 14.9-15.5, and I have not changed the way I drive. The only thing that changed is that I ran low on fuel one day a few weeks ago (computer just clicked to 5 miles to empty, first place I normally stop at was out of diesel for some reason) and then the engine started to drive rough. I pulled over (less than a mile from the gas station) and walked to gas station instead of forcing the issue and running completely out of fuel.
As part of the EGR work I did over the summer, fuel filters were part of that. I purchased a new set of filters this week from a sponsor, and will swap those out this weekend, thinking that might be contributing.
Anything else?
Does cold weather have an impact on diesel engine's MPG?
Should I purchase some of that Ford Diesel anti-gelling fuel additive?
Thanks.
Matt
Now, all of a sudden, I am at 14.9-15.5, and I have not changed the way I drive. The only thing that changed is that I ran low on fuel one day a few weeks ago (computer just clicked to 5 miles to empty, first place I normally stop at was out of diesel for some reason) and then the engine started to drive rough. I pulled over (less than a mile from the gas station) and walked to gas station instead of forcing the issue and running completely out of fuel.
As part of the EGR work I did over the summer, fuel filters were part of that. I purchased a new set of filters this week from a sponsor, and will swap those out this weekend, thinking that might be contributing.
Anything else?
Does cold weather have an impact on diesel engine's MPG?
Should I purchase some of that Ford Diesel anti-gelling fuel additive?
Thanks.
Matt
Elder User
Joined: May 2008
Posts: 765
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From: Patricia, Alberta
Where do you live? Cold weather has a HUGE impact on fuel economy. My wife's Escape pulls 32 mpg in the summer, and it's lucky to get 25 in the winter. Another thing that could have a huge impact on fuel economy is running your injectors out of fuel and screwing them up. I'm not an injector expert (yet), I'll let somebody more qualified explain.
Thread Starter
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Senior User
Joined: May 2010
Posts: 245
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Where do you live? Cold weather has a HUGE impact on fuel economy. My wife's Escape pulls 32 mpg in the summer, and it's lucky to get 25 in the winter. Another thing that could have a huge impact on fuel economy is running your injectors out of fuel and screwing them up. I'm not an injector expert (yet), I'll let somebody more qualified explain.
I am aware running the fuel low like that is not good, which is why I pulled over. It was weird because the computer said 35 miles to empty, and the gas station was merely 15-20 miles away. Regardless, I will see how the new fuel filter affects it.
Thanks.
Posting Guru
Joined: May 2003
Posts: 1,990
Likes: 1
From: Middleburg, FL
Do you have a gauge for monitoring coolant temps? Could very well be that your truck is running a little cooler due to a weak thermostat not allowing the engine to get to full operating temp. That could cost you upwards of 1 mpg.
Fleet Owner
Joined: Nov 2003
Posts: 27,901
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The cold also reduces my mileage. I figure it is related to the programming, but certainly you use a lot of energy to get all that iron heated up.
You also have to realize that you might be getting winter diesel also - less BTU's.
You also have to realize that you might be getting winter diesel also - less BTU's.
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