LOST MPG'S... - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 02-05-2009, 12:31 PM Thread Starter
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LOST MPG'S...

need some help guys...my 06' F-250 FX4 is losing mpg's fast. it was getting a steady, and constant 18.5 forever. Within the last 2 months, it has slowly gone down...seemed like it dropped to 16 overnight, then hoovered around 15 for a while, now it's dippingi into the 14's. The oil is changed regularly, both the fuel filters have been changed twice, the only thing I haven't checked closely is the air filter...opening up the housing it looked clean, and the restriction gauge is in the "normal zone". Any suggestions on what could be causing this?
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post #2 of 19 Old 02-05-2009, 01:24 PM
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winter blend always does the same thing for my truck.

06' F250 6.0L Superduty Crewcab Shortbed Lariet 4x4 Chrome pkg 3.73's
ZOODAD, SCT X3 Street tune...tuned by Innovative Diesel, Edge Insight w/ EGT probe, MBRP 4" Turbo back muffler delete 5" duel wall tip, Harley Headlights equipped with Sylvania Silverstar H13ST High Performance Headlights, Sylvania Silverstars 9005ST Fogs, Recon smoked led taillights and smoked led side markers, Ford molded splash gaurds & Lund Genesis Hinged Soft Tonneau
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post #3 of 19 Old 02-05-2009, 06:35 PM
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Man your lucky the best i hav gotten ever was about 12....and i got a tuner, exaust, and an intake. any body got any sugestions for my problem aswell??

also sorry for the thread hi-jack.
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post #4 of 19 Old 02-05-2009, 06:47 PM
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My truck's doing the same thing.. This happened to me once before & I had a bad injector & needed my PCM & FICM reflashed. My mpg's went back to normal but now they're going down again I was averaging 15-16.5 (55-60mph w/ extreme tune) driving to & from work, now i'm averaging 12-13?? I'm gonna hook mine back up to the computer & see what it says! Do ya have any CEL codes?

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~Other Toys~ 05 Ranger 520VX Commanche 225 HP VMAX HPDI !!
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post #5 of 19 Old 02-05-2009, 06:50 PM
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No codes at all....the truck is at the dealership right now....opened my hood the other day and had an oil/diesel mixture sprayed on the underside of the hood near the aternator.
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post #6 of 19 Old 02-05-2009, 06:52 PM
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hmmm that's not good, keep us posted & let us know what they find out!! Good Luck

~Adam~
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~Other Toys~ 05 Ranger 520VX Commanche 225 HP VMAX HPDI !!
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post #7 of 19 Old 02-05-2009, 06:53 PM
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Its because of the winter fuel! They add k--1 (keroseen).
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post #8 of 19 Old 02-06-2009, 05:28 AM Thread Starter
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the winter fuel mix would be understandable, but i live in New Orleans, LA...true, it's been cold down here this year, but we don't get the same winter mix as you guys up north. i'm interested in what Adam had said about the bad injector, and having to reprogram the PCM. i bought my truck used, and under the hood there is a ford factory authorized sticker, stating that the truck had been "factory reprogrammed" with a " 6C3A-EYA " program. any of you know what this is?
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post #9 of 19 Old 02-06-2009, 06:14 AM
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I think it also depends on how you drive. these 6.0's do very well when you keep the RPM's below 2000. I just drove home from work this morning and reset my MPG as I got on the highway and drove approx. 50 miles w/ the cruise control set at 67 mph (rpm's were around 1800) all highway and my MPG read 18.3 as I got off the highway.
I had to restrain myself from hitting the go pedal when I got around a few nut jobs though.

06' F250 6.0L Superduty Crewcab Shortbed Lariet 4x4 Chrome pkg 3.73's
ZOODAD, SCT X3 Street tune...tuned by Innovative Diesel, Edge Insight w/ EGT probe, MBRP 4" Turbo back muffler delete 5" duel wall tip, Harley Headlights equipped with Sylvania Silverstar H13ST High Performance Headlights, Sylvania Silverstars 9005ST Fogs, Recon smoked led taillights and smoked led side markers, Ford molded splash gaurds & Lund Genesis Hinged Soft Tonneau
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post #10 of 19 Old 02-06-2009, 11:34 AM
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My mileage sucks too, but then again I'm running 37's on 20's with stock gears,,,,doh!

2012 F-350 SRW King Ranch
SOLD - 2004 Lariat F-250 4x4
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