terrible fuel economy - Ford Powerstroke Diesel Forum

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post #1 of 20 Old 11-08-2007, 08:03 AM Thread Starter
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terrible fuel economy

Ok guys I need any ideas you all can throw out. Lately (the past few months or so) I have gotten absolutely terrible fuel economy...like 12 mpg, not towing or anything and not putting my foot into it much. changed my fuel filters roughly 2K miles ago, and I have been running SCT economy tune from DJ. I tried going back to stock to see what I could get... not any better. My wallet can't take this anymore with diesel prices where they are!! Anyone have any ideas for me?? By the way, I have 35" open country MT's.
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post #2 of 20 Old 11-08-2007, 08:07 AM
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post #3 of 20 Old 11-08-2007, 08:12 AM Thread Starter
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no... I've have been running the 35's and SCT for around 5 months... was getting around 15.5 mpg whereas the last month and a half or so I've gotten significantly less.
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post #4 of 20 Old 11-08-2007, 08:14 AM
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Winter blend diesel fuel possibly.

2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
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post #5 of 20 Old 11-08-2007, 08:16 AM
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Whens the last t ime you changed the oil?

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #6 of 20 Old 11-08-2007, 08:16 AM Thread Starter
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well maybe, but i live in texas...
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post #7 of 20 Old 11-08-2007, 08:17 AM Thread Starter
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changed my oil 800 miles ago...
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post #8 of 20 Old 11-08-2007, 08:19 AM
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How much oil did you drain from the pan?
I had injectors leaking once and the result was vary bad fuel milage - fuel leak = poor milage - anyway, i always think of that when i hear a story like yours.
Check your oil level closely and if it seems to rise, theres your problem.
If not, then i have no idea what to tell you.

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #9 of 20 Old 11-08-2007, 08:25 AM Thread Starter
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thats a good idea...i'll start monitoring that pretty closely. when I drained the oil I drained straight into a big drum so I don't know exactly how much. I figure something has to be wrong to see a drop that significant...

and chris why are you getting rid of your AFE stage II ?
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post #10 of 20 Old 11-08-2007, 08:26 AM Thread Starter
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sorry...clay, don't know why i called you chris.
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