Low Mpg, what to do? - Ford Powerstroke Diesel Forum
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Old 09-16-2013, 02:41 PM
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Low Mpg, what to do?

Have a 2001 F350 CC LWB 4x4 Auto with a 6637 and a walker btm installed. I'm getting getting about 14.7mpg on the highway and city driving is lower ( about 350 miles per fill up ). I took the truck into the shop and mechanic came back and said that the computer is showing the truck was chipped ( and drives like it too) by the previous owner. When I haul my 4k trailer in the city I get around 10. What else can I do to increase the mpg?
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Old 09-16-2013, 02:49 PM
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Check for boost leaks or exhaust leaks. Check/clean exhaust pressure tube/sensor. When was the oil changed last?
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Old 09-16-2013, 02:50 PM
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Any idea what chip it is? What tune it's setup for?

How do you drive?

I essentially have the same truck and I get 17-18 on the highway, not towing. I do get about 10-11 when I'm towing my 12K 5th wheel.

Filters (air, fuel, oil) changed regularly? Keep the tire pressure checked? Is it possible you have caliper dragging?

Just some thoughts?
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Old 09-16-2013, 03:18 PM
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I changed the oil a month ago with 1 quart of Lucas added. No exhaust leaks and I cleaned the exhaust sensor and tube. Fuel filter changed also last month with fuel cleaner. I try to granny it on the road to keep the fuel usage low. I don't know what type of chip is in it and would love to find out and how. It smokes very faintly at idle, sort of a white smoke. If I changed the ebpv would that help some?
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Old 09-16-2013, 03:27 PM
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Is the white smoke only at start up or constant?
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Old 09-16-2013, 04:06 PM
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It is a very, very faint smoke. But yes it is constant.
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Old 09-18-2013, 09:00 AM
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I would get the stock tune loaded back on the PCM and go from there. First part of many diagnostic sessions is to take any non factory tuning out of the equation.
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Old 09-18-2013, 10:32 AM
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Sounds like a good idea. That brings me to a few more questions:
1. How do I reset the PCM back to stock and if I do is there a way I can return it to the chipped setting? Is there a way I can do this by myself?

2. Are the numbers that I am getting sound too low or normal? I would assume the truck would get better MPG with the mods I have thrown at it.

Lastly, would a truck not tuned correctly get lower fuel economy?
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Old 09-19-2013, 08:51 AM
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if it has a chip remove the pcm and pull the chip from the computer box, if it was a tuner on it im sure there is a way to reset it via a scan tool of some kind?
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Old 09-19-2013, 03:58 PM
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I looked at the PCM and don't see any chip installed. So the truck must have been tuned. I have an Actron Elite AutoScanner CP9185 and was wondering if there was a way to use it to set the truck back to stock?
I remember when there was some transmission trouble last year and the trans tech said that the truck was showing a turbo boost code. Yet I have never seen it on my personal scanner. Would such a code lower the MPG?
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