cant get any kind of mpgs.... - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 33 (permalink) Old 07-16-2009, 09:59 PM Thread Starter
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cant get any kind of mpgs....

my 2008 in the sig is what i'm talking about, i can't get over 14 mpg out of it no matter what i do. any ideas? i tried several tunes, the one i am having the best luck with is a tune i got from matt at gear head performance. which is where i'm getting 14. when cruising at about 60 mph egts are about 620 -650 depending on headwind and the road. gears are 3:73 and tires are a 33x12.5x18. and yes the speedo is correct as these are an inch taller than my stock tires.

08 250= sold
2005 CCSB 6.0= sold
2011 CCLB 350 dually lariat, 4x4, 6.7 all stock
95 ex cab long bed f250,4x4,7.3 auto with 4.10s and swamps tuning, 3 inch dp.for sale!!!
2002 ex cab long bed 4x4 7.3 auto. Stock and 294k on the clock.
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post #2 of 33 (permalink) Old 07-19-2009, 01:36 AM
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Re: cant get any kind of mpgs....

You're getting about what one would expect from your configuration - maybe a bit low.

Your auto and 4x4 are kicking your MPG in the crotch. Your EGT seems too high to me. I run 450 degrees at 60 MPH (no wind).

Chucking the auto & 4x4 are out of the question, so the only recommendation I have is get a tonneau cover. Those are good for an extra 1.5 MPG over what you are getting now.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
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post #3 of 33 (permalink) Old 07-19-2009, 01:54 AM
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Re: cant get any kind of mpgs....

make sure your hubs are unlocked... they will cause it to go down

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post #4 of 33 (permalink) Old 07-21-2009, 06:26 PM Thread Starter
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Re: cant get any kind of mpgs....

im not sure i can unlock my hubs, they are automatic hubs, it says locked or auto on them, are these the same as the older style manual hubs?

08 250= sold
2005 CCSB 6.0= sold
2011 CCLB 350 dually lariat, 4x4, 6.7 all stock
95 ex cab long bed f250,4x4,7.3 auto with 4.10s and swamps tuning, 3 inch dp.for sale!!!
2002 ex cab long bed 4x4 7.3 auto. Stock and 294k on the clock.
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post #5 of 33 (permalink) Old 07-21-2009, 06:30 PM
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Re: cant get any kind of mpgs....

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Originally Posted by geared_low550 View Post
im not sure i can unlock my hubs, they are automatic hubs, it says locked or auto on them, are these the same as the older style manual hubs?
When you have the hubs in "auto" you need to reverse in 2wd to get them to unlock. I'm assuming you use reverse in your truck, so that should have happened anyway, but it is worth a try...

2006 F250 CC LB FX4 Lariat
ARP studs, SCT X3 IDP & Gearhead tuned, S&B CAI, straight pipe, FASS 150/180, FCDP solid uppipe, Dieselsite coolant filter
2.5" BTS leveling kit, 35" Xtreme A/T's on XD Hoss 18's, N-Fab prerunner bar w/ 3 9" Hellas
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post #6 of 33 (permalink) Old 07-21-2009, 06:46 PM Thread Starter
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Re: cant get any kind of mpgs....

well i knew you had to do that to unlock them, i also have noticed a 2 mpg improvement by cutting down idle time

08 250= sold
2005 CCSB 6.0= sold
2011 CCLB 350 dually lariat, 4x4, 6.7 all stock
95 ex cab long bed f250,4x4,7.3 auto with 4.10s and swamps tuning, 3 inch dp.for sale!!!
2002 ex cab long bed 4x4 7.3 auto. Stock and 294k on the clock.
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post #7 of 33 (permalink) Old 07-21-2009, 06:47 PM
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Re: cant get any kind of mpgs....

What are other 6.4's with similar mods seeing for mpg?

2006 F250 CC LB FX4 Lariat
ARP studs, SCT X3 IDP & Gearhead tuned, S&B CAI, straight pipe, FASS 150/180, FCDP solid uppipe, Dieselsite coolant filter
2.5" BTS leveling kit, 35" Xtreme A/T's on XD Hoss 18's, N-Fab prerunner bar w/ 3 9" Hellas
Pioneer double din, JL components, 3 10" Pioneer subs

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post #8 of 33 (permalink) Old 07-21-2009, 06:48 PM Thread Starter
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Re: cant get any kind of mpgs....

well everyone i asked about it tells me they see 16-18 under normal city and highway and some claim 22-24 highway with the spartan tunes.

08 250= sold
2005 CCSB 6.0= sold
2011 CCLB 350 dually lariat, 4x4, 6.7 all stock
95 ex cab long bed f250,4x4,7.3 auto with 4.10s and swamps tuning, 3 inch dp.for sale!!!
2002 ex cab long bed 4x4 7.3 auto. Stock and 294k on the clock.
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post #9 of 33 (permalink) Old 07-21-2009, 07:05 PM
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Re: cant get any kind of mpgs....

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Originally Posted by geared_low550 View Post
well everyone i asked about it tells me they see 16-18 under normal city and highway and some claim 22-24 highway with the spartan tunes.
That seems real high to me. Our 6.4 gets 11. I couldn't see gaining 11 more mpg with a tune and a DPF delete.

2006 F250 CC LB FX4 Lariat
ARP studs, SCT X3 IDP & Gearhead tuned, S&B CAI, straight pipe, FASS 150/180, FCDP solid uppipe, Dieselsite coolant filter
2.5" BTS leveling kit, 35" Xtreme A/T's on XD Hoss 18's, N-Fab prerunner bar w/ 3 9" Hellas
Pioneer double din, JL components, 3 10" Pioneer subs

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post #10 of 33 (permalink) Old 07-21-2009, 07:08 PM Thread Starter
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Re: cant get any kind of mpgs....

mine got 10 until i did anything to it, but my dad has a cc sb 4x4 6.4 and gets 16-19 every tank hand figured, we even switched trucks and mileage stayed the same on each for 3 days worth of driving

08 250= sold
2005 CCSB 6.0= sold
2011 CCLB 350 dually lariat, 4x4, 6.7 all stock
95 ex cab long bed f250,4x4,7.3 auto with 4.10s and swamps tuning, 3 inch dp.for sale!!!
2002 ex cab long bed 4x4 7.3 auto. Stock and 294k on the clock.
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