Serious loss of MPG on 6.0 - Ford Powerstroke Diesel Forum
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Old 11-13-2012, 04:08 PM
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Serious loss of MPG on 6.0

Noticed a drop from around 12 MPG city to 10.5 but was very due for an oil change. Did it myself using Valvoline 15W-40 Premium Blue and dumped in some Cetane booster/Cleaner. MPG went back up to 12.6 for a day. Last night dropped below freezing now im getting 9.6 MPG. Any ideas? Cant afford to keep running on 9.6 MPG.
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Old 11-13-2012, 04:14 PM
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Maybe this sound dumb but how about the tires pressure? Low tire pressure leads to drop in MPG. Which oil weight are you using right now? How about the fuel filters, maybe the fuel filters are clogged. Keep us informed.
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Old 11-13-2012, 04:20 PM
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What year is the truck?

Might want to check FICM volts. MY MPG was better after fixing the FICM.

Also check readings from:

EBP
MAP
BAR
Key on engine off, these should read the same or real close.

Could clean the EBP sensor and tube, and the MAP sensor and hose, and where the hose connects to manifold.
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Old 11-13-2012, 04:30 PM
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Tires are a bit low. I havnt tried the FICM but i have no idea where to look for the other 3. I used 15W40 premium blue. Havnt done fuel filters yet thats next pay day.
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Old 11-13-2012, 04:54 PM
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MAP is on the passenger side fire wall, on a bracket.

EBP well, that depends on what year your truck is.

Either it's hooked on the T stat housing,(03-04) or under the degas tank.(05-07) Good way to find that out is to find the metal tube that is hooked into the driver side exhaust manifold and follow it up to the sensor. You can use a weed eater line or something similar to clean it out.

And, just for giggles, did you use Ford filter on this change?
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Old 11-13-2012, 04:57 PM
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See the hose running by the oil fill cap? That is the MAP hose. Hooks right in that bracket at the bottom of the picture.

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Old 11-13-2012, 05:00 PM
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Ok ill look thanks. Do i need to run a diagnostic for the sensors or a volt meter? Honestly dont remember the filter brand.
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Old 11-19-2012, 07:26 PM
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Tested the FICM seems fine 48v solid. cleaned EBP hose and sensor, EGR Valve, Map tube, replaced fuel filters, added cetane booster/cleaner, added lucas non slip tranny crap. When i had my EGR valve out all i can say is HOLY $H!T the intake is nasty. If i had the money i would buy all next gaskets and rip the engine apart. Still sitting at about 10MPG city.
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Old 11-19-2012, 07:48 PM
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Anything else i could do to improve my MPG? Everything is stock and for now its staying that way so im looking for the most inexpensive way to improve my MPG.
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Old 11-19-2012, 08:31 PM
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Since it is cold, idling will knock down the MPGs.

Sticking caliper on one of the corners? This can bring down MPGs. Not sure why the first day after oil change, it went up.

All city, does the truck ever warm up?
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