TERRIBLE FUEL MILEAGE - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 04-20-2011, 09:29 PM Thread Starter
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TERRIBLE FUEL MILEAGE

My 05 6.0 has a MBRP exhaust and street tune from innovative. No code, 48 volts @ FICM, runs awesome.

I average 8mpg city on straight fuel and around 10mpg with diesel kleen+cetane booster. That is with a light foot and seeing WOT for a few seconds once a day.

What in gods name could be causing this? I bought the truck expecting to be getting 13 city all day.


wanted to add:

fresh rotella 10w-40 every 5k, fresh fuel filters every 15k

SCT says my coolant temp is around 186 once warmed up fully. I heard the thermostat doesnt open until 190+???

2005 F250 SCSB XLT 4X4- Studded-EGR Delete-OEM HEAD GASKETS(black onyx failed)-Oil Cooler Rebuild-HPOP fitting-6.4 Banjos-Blue Fuel Pressure Spring-MBRP 4"-Innovative Tunes-Viper Remote Start-BFG 35s-2.5" Leveling Kit-- 13.9 @ 95mph on x-street, x-race should be good for ~13.6


Last edited by ckyguy68; 04-20-2011 at 09:36 PM.
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post #2 of 15 Old 04-21-2011, 04:23 AM
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you coolant temp is good, normal running is around 188F when it gets hot out or you start working does it climb up over 190 but not by much usually

04' F-250 6.0L

AFE Stage 2 intake
Liberator EGR delete kit
4" MBRP Turbo back (straight piped) WHISTLE
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zoodad mod
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Upgraded fuel pressure spring kit
upgraded turbo oil supply tube(solid)
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post #3 of 15 Old 04-21-2011, 08:29 AM
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I have the same truck but stock tune and I just filled up this morning. I avg 14.7 on my last fill up. I drive 70/30 highway/city. Besides the tune the only thing I am doing different is I'm adding about 28-30 oz of 2 cycle oil at ever fill up. I run that and then will do DK about once a month. Seems to work well for my truck. I would also change your fuel filters at 10K but that's just me.

Brian


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post #4 of 15 Old 04-21-2011, 08:33 AM
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Where do you live? The fuel maybe? The witner mix up north sucks.

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post #5 of 15 Old 04-21-2011, 08:49 AM Thread Starter
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I live in Michigan, and my gas station buddy said we are still on winter fuel.

Thought i would also add that my truck has 76,000 miles on it and I do also run 2 stroke oil. Saw negligible gains in MPG but it really quiets the truck down.

2005 F250 SCSB XLT 4X4- Studded-EGR Delete-OEM HEAD GASKETS(black onyx failed)-Oil Cooler Rebuild-HPOP fitting-6.4 Banjos-Blue Fuel Pressure Spring-MBRP 4"-Innovative Tunes-Viper Remote Start-BFG 35s-2.5" Leveling Kit-- 13.9 @ 95mph on x-street, x-race should be good for ~13.6

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post #6 of 15 Old 04-21-2011, 09:13 AM
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I get 14MPG towing a 15K RV, The truck fan speed is also calibrated at 195F, And the turbo pressure is at 10PSI. I found out that the fan will calibrate temperature at 190F when programed stock and if the thermostat does not alow the water temperature to hit 190F you are running the truck with a closed turbo and fuel enriched to heat up the engine to 190F.
You will never know where your fuel lost is unless you have the Scangauge to indicate the bad fuel mileage.
I read many Forums and every problem I see can be found an resolved with a running gauge that will tell FIMC volt, EOT, Instaneous MPG, Fan Speed, digital Coolant temperature.
So A gauge at $160 would surely pay for itself in a little time as it did with mine.

2005, 6.0L, 6 Spd Std, 3.73 Rear End, F250SD, Extended Cab, 4 x 4 Long Bed. 2008 extension mirrors. GPS/TV/DVD/CD/Rear Cam/Radio installed, Max Energy programer by Hypertech, and Fuel Pressure Gauge. ScanGaugeII for 60 plus XGauges, and MPG. ELC Cat EC-1 Coolant, Pull a 39ft 15500Lbs 5th Wheel Camper Trailer. Mileage Avg is 20MPG, and pulling 12.6MPG.
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post #7 of 15 Old 04-21-2011, 09:39 AM Thread Starter
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Quote:
Originally Posted by caissiel View Post
I get 14MPG towing a 15K RV, The truck fan speed is also calibrated at 195F, And the turbo pressure is at 10PSI. I found out that the fan will calibrate temperature at 190F when programed stock and if the thermostat does not alow the water temperature to hit 190F you are running the truck with a closed turbo and fuel enriched to heat up the engine to 190F.
You will never know where your fuel lost is unless you have the Scangauge to indicate the bad fuel mileage.
I read many Forums and every problem I see can be found an resolved with a running gauge that will tell FIMC volt, EOT, Instaneous MPG, Fan Speed, digital Coolant temperature.
So A gauge at $160 would surely pay for itself in a little time as it did with mine.

Very interesting. I have access to a Ford VCM/IDS so i will take a look at all those PIDs.

With a custom tune from eric can i still use the sct to change when my fan comes on? I've never really heard it come on but just to be sure maybe I can bump it up to 200.

I noticed a couple weeks ago when we had a 85 degree day (thats michigan for ya) it seemed to run better and wasnt drinking as much fuel.

2005 F250 SCSB XLT 4X4- Studded-EGR Delete-OEM HEAD GASKETS(black onyx failed)-Oil Cooler Rebuild-HPOP fitting-6.4 Banjos-Blue Fuel Pressure Spring-MBRP 4"-Innovative Tunes-Viper Remote Start-BFG 35s-2.5" Leveling Kit-- 13.9 @ 95mph on x-street, x-race should be good for ~13.6

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post #8 of 15 Old 04-21-2011, 11:35 AM
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Have you had the PCM and FICM reflashed? Are you the original owner?


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post #9 of 15 Old 04-21-2011, 11:56 AM Thread Starter
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Quote:
Originally Posted by HeavyAssault View Post
Have you had the PCM and FICM reflashed? Are you the original owner?
My vehicle strategy is VXCF7N3. It was flashed to the most recent ones in 2009 i believe. I am the third owner and have reviewed the Oasis reports and the previous owner has receipts for all the maintenance items. He took very good care of it but said he never paid attention to mileage.

2005 F250 SCSB XLT 4X4- Studded-EGR Delete-OEM HEAD GASKETS(black onyx failed)-Oil Cooler Rebuild-HPOP fitting-6.4 Banjos-Blue Fuel Pressure Spring-MBRP 4"-Innovative Tunes-Viper Remote Start-BFG 35s-2.5" Leveling Kit-- 13.9 @ 95mph on x-street, x-race should be good for ~13.6

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post #10 of 15 Old 04-21-2011, 12:06 PM
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I'd call Power Hungry Performance asking about that strategy. They can do roll backs on the PCM and FICM. I'm running VXCF4M3 and PHP FICM tuning with great results for mileage. My winter time stats are usually 14mpg +/- mixed driving and climbs into the 16's mixed in the summer. Your reported 8-10 is WAY below normal I'd expect 12 where you live. OAT does play a big part in overall MPG numbers.


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