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Old 12-03-2011, 02:57 PM
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terrible mpg

went from 17 mpg to 12 mpg. air intake is clean. what now?
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Old 12-03-2011, 03:23 PM
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How did you calculate mileage? Hand calculations or computer? How did you have the truck a year ago? It could be "winter fuel" causing a drop. Not sure about 5mpg though.
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Old 12-03-2011, 07:07 PM
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Fig milage both ways. It's been going on for months. Only change I can think of is that I had to replace fuel injector module. Or at least that is what ford dealer said they did.
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Old 12-03-2011, 07:36 PM
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What truck you got? Mods. Info Info Info.
Brakes dragging, low tire pressures, and the list goes on. Not that simple to just say what it is, but it could be a simple fix.
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Old 12-03-2011, 07:56 PM
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F 350 dually w 6.0. No drag and just put new tires on.
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Old 12-03-2011, 07:59 PM
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Send a message via Skype™ to 2003kingranch
Well if you got a new FICM then they probably re programed your truck to a new . Bam Worse mpg


Sent from my iPhone using Autoguide
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Old 12-03-2011, 08:11 PM
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How can I reprogram FICM without taking it back to dealer? I just cant afford them.
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Old 12-03-2011, 08:17 PM
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Yup, they did a computer reflash. They did mine when the FICM was replaced and now the mileage sucks............
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Old 12-03-2011, 08:23 PM
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Any ideas on how to reprogram it to do better?
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